Keywords: HYDROGEN FLUORIDE/ AIR POLLUTION
Abstract: 2 tab.
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Keywords: ECOLOGY/ BLUE MOUNTAIN/ AIR POLLUTION/ ZINC/ HEAVY METALS
Abstract: 1 fig. 3 tab.
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Keywords: AIR POLLUTION/ VASCULAR PLANTS
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Keywords: ARIZONA / USA / FLORA
Abstract: [51 species.]
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Keywords: ARIZONA/ XANTHOPARMELIA/ NEW TAXA
Abstract: 2 fig. [New: Parmelia dissensa sp. nov. and P. huachucensis sp. nov.]
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Keywords: ARIZONA
Abstract: [33 taxa. This paper was previously cited and incorrectly attributed to W.A. Weber alone.]
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Keywords: PARMELIA/ NEW TAXA/ XANTHOPARMELIA/ ARIZONA/ KEY
Abstract: 16 fig. [22 species; key. New Xanthoparmelia nigropsoromifera sp. nov.]
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Keywords: AIR POLLUTION / ARIZONA / UTAH / FLORA / USA
Abstract: [147 species from Arizona and Utah.]
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Keywords: NEW TAXA/ XANTHOPARMELIA/ NEW MEXICO/ USA/ FLORA
Abstract: [New: Parmelia joranadia sp. nov.]
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Keywords: DESERT / BIOMASS / COMMUNITY ECOLOGY
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Keywords: ARIZONA/ CHECKLIST/ CATALOG
Abstract: [474 taxa.]
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Keywords: ARIZONA/ MARICOPA COUNTY/ USA/ DESERT/ KEYS
Abstract: 1 figure. 1 table. [78 species; keys.]
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Keywords: AIR POLLUTION/ REVIEW
Abstract: 1 figure. [Review with 64 references.]
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Keywords: NITROGEN DIOXIDE/ OXIDANTS/ AIR POLLUTION
Abstract: 1 figure.
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Keywords: XANTHORIA/ NEW TAXA/ ARIZONA/ MEXICO/ TONINIA/ LECANORA
Abstract: 3 figures. [New: Xanthoria concinna sp. nov., Lecanora collatolica sp. nov.]
[Edit/Delete] [Upload PDF/URL] [ET: 1347]
Keywords: ARIZONA/ EXSICCAT
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Keywords: EXSICCAT/ NASH
Abstract: [labels for nos. 1-50 in this new exsiccat.]
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Keywords: ARIZONA/ LEPTOGIUM
Abstract: 1 figure. 1 table. [244 species. Leptogium leceroides B. de Lesd. new to the United States.]
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Keywords: DESERTS/ DISTRIBUTION/ ECOLOGY/ BIOMASS
Abstract: 1 figure. 4 tables.
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Keywords: PARMELIA/ XANTHOPARMELIA/ SONORAN DESERT/ SAXICOLOUS/ ECOLOGY/ POPULATIONS
Abstract: 2 figures. 2 tables. [Sympatric chemotypes distributed nonrandomly on rocks of different chemical composition.]
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Keywords: ALASKA/ PHOTOSYNTHESIS/ WATER RELATIONS/ CETRARIA
Abstract: 1 figure. ["With the exception of rainly periods, the lichen exhibited a strong diurnal pattern with peak photosynthetic activity occurring between 0300 and 0700 h. This correlated with periods of maximal lichen water retention and the presence of direct solar radiation. When the lichen was moist, a strong gradient in photosynthetic acitivity was observed with no activity in the lichen bases and maximal activity in the lichen tips."]
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Keywords: AIR POLLUTION/ REVIEW/ NETHERLANDS
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Keywords: CHEMOSYNDROME/ XANTHOPARMELIA/ DEPSIDE/ 3-A-HYDROXYBARBATIC/ MEXICO
Abstract: 7 figures. 1 table. [New: Xanthoparmelia moctezumensis Nash sp. nov. Includes distributional and chemical data on X. ajoensis and X. tucsonensis as well.]
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Keywords: AIR POLLUTION/ NEW MEXICO/ SO2/ FOUR CORNERS/ DESERT
Abstract: 3 figures. 1 table. [159 species in 40 genera are reported. Although the SO2 levels are relatively high in the area, the lichens so far seem unaffected. Authors contend that the aridity of the area and dominance of resistant crustose forms explain the departure of the results from previous air pollution studies.]
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Keywords: ALASKA/ CARIBOU/ GRAZING/ ASPICILIA/ NEW TAXA
Abstract: 2 figures. 1 table. [288 species in 71 genera are reported for the area. New: Aspicilia plicigera (Zahlbr.) Thoms., comb. nov. and A. sublapponica (Zahlbr.) Thoms., comb. nov. Both "new combinations, " however, are invalid since the proper citations were not included after listing of the basionyms (Article 33). The combination Aspicilia plicigera (Zahlbr.) Ras. has been published previously. Caribou grazing during the winter severly reduced lichen biomass in certain areas of the region.]
[Edit/Delete] [Upload PDF/URL] [ET: 1028]
Keywords: EDITORIAL/ COLLECTING/ COSTA RICA/ ETHICS
Abstract: [Editorial.]
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Keywords: MEXICO/ BAJA CALIFORNIA/ RAMALINA/ ROCCELLA/ WATER RELATIONS/ PHOTOSYNTHESIS
Abstract: 3 tables. 4 figures. [Transect studies and water retention and loss experiments, primarily with Ramalina complanata and Roccella babingtonii, show that the coastal species (Roccella) is adapted to moister conditions. Peak photosynthesis for this taxon is about 70% thallus saturation while the peak for Ramalina complanata was about 30-40% thallus saturation.]
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Keywords: PARMELIA/ HYPOGYMNIA/ OZONE/ AIR POLLUTION/ CALIFORNIA/ PHOTOSYNTHESIS/ FUMIGATION
Abstract: 1 figure. [Parmelia sulcata and Hypogymnia enteromorpha from San Diego County, California, were subjected to 12 hour ozone fumigations at three different concentrations. Significant reduction in gross photosynthesis was documented. P. sulcata was more sensitive to the treatments than was H. enteromorpha, "... a fact consistent with field observations in southern California where extensive ozone injury occurs."]
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Keywords: ALASKA/ CARIBOU/ SO2/ PHOTOSYNTHESIS
Abstract: 3 tables. 1 figure. [Study conducted at Anaktuvuk Pass, Alaska. "The photosynthetic capabilities of the test species were either destroyed or significantly reduced depending upon the SO2 stress gradient over the fumigation plot." Sampling 1 year later showed no significant recovery.]
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Keywords: PHOTOSYNTHESIS/ GAS EXCHANGE/ ARCTIC/ CLADONIA/ PARMELIA/ CLADINA
Abstract: 2 tables. 3 figures. ["The highest rates of both photosynthesis and respiration occur in the youngest, actively growing sections of the thalli and both parameters decrease progressively into older sections." Studies on Cladonia rangiferina, C. stellaris and Parmelia separata were conducted at Anaktuvuk Pass, Alaska.]
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Keywords: AIR POLLUTION/ OXIDANTS/ CALIFORNIA/ SAN BERNARDINO MOUNTAINS
Abstract: 2 figures. 1 table. [General review with special empahsis on recent studies in the San Bernardino Mountains of southern California.]
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Keywords: OWN/ UTAH/ ZION NATIONAL PARK/ AIR POLLUTION
Abstract: 1 figure. [Authors report 159 species in 53 genera; four are new records for Utah. "Potential for air pollution injury to the lichen vegetation is high because a new coal-fired power generating plant is proposed 30 km downstream from the canyon."]
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Keywords: REVIEW
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Keywords: AIR POLLUTION/ OWN/ CALIFORNIA/ ECOLOGY/ REVIEW/ TOLERANCE
Abstract: 6 figures. ["In areas where pollution sources have existed for a number of years, distinct patterns reflecting differential sensitivity to the pollutants are apparent on the basis of species richness considerations. Thus sensitive species are excluded from areas with high air pollutant concentrations; these niches are then often filled by tolerant species. Finer resolution of the patterns may be obtained by quantitatively documenting the abundance and/or relative vitality of species. By employing this aproach together with modern multivariate analysis procedures it is possible to detect patterns developing in lichenized fungal populations in areas where air pollution has been present for a comparatively short time."]
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Keywords: NEW MEXICO/ HEAVY METALS/ AIR POLLUTION/ FLY ASH/ FLUORINE
Abstract: 3 tables. 1 figure. ["Within a several kilometre radius of the Four Corners Power Plant, lichen species had elevated concentrations of B, F, Li and Se compared with lichens of more remote sites. The elements Ba, Cu, Mn and Mo were found in elevated concentrations, but only in one lichen species. The patterns of elements occurring in both elevated and non-elevated levels correspond very closely to published chemical data on enrichment ratios and elemental solubility for post-precipitator fly ash. Within a 2 km radius F was found in concentrations potentially toxic to lichens."]
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Keywords: SONORAN DESERT/ PHOTOSYNTHESIS/ MICROCLIMATE/ PRECIPITATION/ WATER RELATIONS/ NEGEV DESERT/ ISRAEL
Abstract: ["Preliminary photosynthetic measurements over 28 d confirmed that days with photosynthetic activity are tightly coupled with precipitation events." Comparisons are made with similar studies in the Negev Desert.]
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Keywords: PHOTOSYNTHESIS/ SONORAN DESERT/ PARMELIA/ XANTHOPARMELIA/ ACAROSPORA/ LIGHT/ TEMPERATURE/ ADAPTATION
Abstract: 2 figures. [Study on Parmelia kurokawae and Acarospora schleicheri during drying under four light regimes and five temperatures. "The relatively low temperature optima reflect the fact that the lichens are most active in winter, particularly in early morning hours."]
[Edit/Delete] [Upload PDF/URL] [ET: 1043]
Keywords: DESERTS/ WATER RELATIONS/ ECOPHYSIOLOGY/ REVIEW/ NORTH AMERICA
Abstract: 1 table. [General review comparing interior desert regions with Pacific coastal desert regions.]
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Keywords: PHOTOSYNTHESIS/ CLADONIA/ ALASKA/ WATER RELATIONS/ ECOLOGY/ PHYSIOLOGY/ TUNDRA/ ARCTIC
Abstract: 15 figures. 2 tables. [Studies carried out at Anaktuvuk Pass, Alaska, concluded that "... photosynthetic activity in both species closely paralleled atmospheric moisture status, where peak photosynthetic rates were attained during or following sporatic summer rain. In addition, thallus absorption of moisture during extended periods of high atmospheric water vapor content gave rise to short periods of minimal photosynthetic activity." Greatest photosynthetic activity was measured in apical portions of the thalli.]
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Keywords: SO2/ CETRARIA/ CLADONIA/ FUMIGATION/ PHOTOSYNTHESIS/ RECOVERY/ ALASKA
Abstract: 2 tables. [Three-year study carried out at Anaktuvuk Pass, Alaska, using Cladonia stellaris, C. rangiferina and Cetraria cucullata. "The lichen vegetation which had experienced the greatest SO2 stress during the 1978 fumigation remained photosynthetically inactive. Significant photosynthetic recovery was discovered in the test species which had experienced sublethal concentrations of SO2; however, their photosynthetic capacities remained less than controls."]
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Keywords: VOLCANIC ASH/ LOBARIA/ PELTIGERA/ WASHINGTON/ MINERAL/ PHOTOSYNTHESIS / POSTASSIUM
Abstract: 2 figures. 3 tables. [Lobaria oregana and Peltigera aphthosa had reduced levels of internal potassium, phosphorus, and photosynthetic capability.]
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Keywords: PHOTOSYNTHESIS/ CO2 CONCENTRATION/ PHYSIOLOGY
Abstract: 1 figure. [All six species tested showed "...a linear range of CO2 values, but little photosynthetic variation with increasing CO2 concentrations at the upper range of CO2 vlaues." Results are similar to those for higher plants.]
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Keywords: OZONE/ AIR POLLUTION/ PHOTOSYNTHESIS/ FUMIGATION/ PSEUDOPARMELIA/ RAMALINA/ CALIFORNIA/ ECOLOGY/ PHYSIOLOGY
Abstract: 3 figures. [The effects of long-term and short-term fumigations were studied on Pseudoparmelia caperata and Ramalina menziesii with special reference to the Santa Monica Mountains of southern California. "From results of these laboratory studies, it is inferred that ozone is contributing to the unusually low lichen cover observed in the field. However, the absence of R. menziesii from these mountains appears to be independent of ozone pollution."]
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Keywords: COMMUNITIES/ ECOLOGY/ CALIFORNIA/ AIR POLLUTION/ OXIDANTS/ TRANSPLANTS
Abstract: 9 tables. 5 figures. [Authors report a 50% decline in lichen diversity since the early 1900's, and "...at sites with high oxidant levels, marked morphological deterioration of the common species Hypogymnia enteromorpha was documented." Transplants showed marked deterioration after a year's exposure in the San Bernardino Mountains.]
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Keywords: PHOTOSYNTHESIS/ CO2 DEPENDENCIES/ TECHNIQUES/ PARMELIA/ ARIZONA
Abstract: 1 table. 4 figures. [Study done on Parmelia praesignis from Arizona, showed that CO2 " ... dependencies were the same in contrast to the wide differences found in earlier reports. Net gas exchange and 14CO2 methods were empirically compared with the conclusion that curvature relationships are statistically indistinguishable."]
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Keywords: PHOTOSYNTHESIS/ PARMELIA/ RESATUATION/ WATER RELATIONS/ OWN
Abstract: 2 figures. 1 table. ["Less than 2 h was required for full recovery of phytosynthetic ability after having been dry for at least 5 weeks. The resaturation phenomenon is mathematically described for the first time as a negative exponential from which parameters can be derived for maximal net photosynthetic rate, maximal velocity and the velocity at the half-time for recovery."]
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Keywords: ALASKA/ OWN/ COMMUNITY STRUCTURE/ ARCTIC/ SAXICOLOUS
Abstract: 2 figures. 1 table. [The distribution of foliose, fruticose and crustose forms was studied in relation to the degree of surface slope. Foliose species dominated the 0 deg. and 30 deg. slopes while crustose and foliose lichens were equally common on 60 deg. slopes. Vertical surfaces were dominated by crustose forms.]
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Keywords: PARMELIA/ OWN/ PHOTOSYNTHESIS/ WATER RELATIONS/ TEMPERATURE
Abstract: 1 table. 2 figures. ["Storage -hydration and temperature regimes have been shown to cause losses in phytosynthetic ability over time. Variable temperatures within the range occurring naturally for the species in the field, with wetting every few days, was least detrimental, while constant temperatures and daily soaking proved to be most detrimental."]
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Keywords: PARMELIA/ FLAVOPUNCTELIA/ ARIZONA/ PHOTOSYNTHESIS/ WATER RELATIONS/ LIGHT EFFECTS/ CO2 EXCHANGE
Abstract: 2 figures. 1 table. [Net photosynthetic rates for Arizonan specimens " ... were obtained as a function of 5 light levels, 5 temperature levels, and of water content as thalli dried from saturated conditions. The greatest maximal net photosynthetic rate occurred at higher temperatures as the light intensity increased. In the light, maximal water efficiency and sensitivity to changes in water content were generally maximal at tempertures yielding the greatest maximal net photosynthetic rates."]
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Keywords: REVIEW/ OWN
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Keywords: LICHINELLA/ MEXICO/ NEW TAXA/ KEY/ PORTUGAL/ SPAIN/ USA/ ARIZONA
Abstract: 31 figures. [New: Lichinella intermedia sp. nov., L. flexa sp. nov., and L. robustoides sp. nov. New distributional records are also reported for L. americana, L. robusta and L. stipatula.]
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Keywords: CO2 EXCHANGE/ PHOTOSYNTHESIS/ MODEL/ PARMELIA
Abstract: 6 figures. 1 table. ["The multivariate models given here, whether for net photosynthesis or its components, carboxylation rate and dark respiration, are, of course, just initial advances towards a multi-dimensional understanding of lichen gas exchange." Most of the work reported used Parmelia praesignis as the experimental organism.]
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Keywords: ARIZONA/ HYPOTRACHYNA/ NEW TAXA/ PYXINE/ OWN
Abstract: [Author reports 72 new additions to the lichen flora of Arizona including Pyxine chrysanthoides, Hypotrachyna subsaxatilis (both new to the United States) and H. polydactyla (first report from the New World). New: Hypotrachyna polydactyla (Krog & Swinscow) comb. nov.]
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Keywords: REVIEW
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Keywords: ECOLOGY/ POPULATIONS/ RAMALINA/ MORPHOLOGY/ GRADIENTS/ CALIFORNIA/ OREGON/ MEXICO
Abstract: 2 tables. 6 figures. [Morphological variation in Ramalina menziesii from Baja California to British Columbia especially regarding the number of perforations present in 15 mm long net buds. "When this measure was plotted against distance inland and latitude of origin, some clear trends emerged. Most conspicuous was that proximity to the coast was correlated with very few perforations per net." Other factors were also analyzed.]
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Keywords: ECOLOGY/ WATER RELATIONS/ POPULATIONS/ CALIFORNIA/ TENSILE STRENGTH/ GRADIENTS/ MORPHOLOGY/ ADAPTATIONS
Abstract: 4 figures. 2 tables. [Authors found that "... the presence of elevated intrathallus concentrations of NaCl found near the coast is mainly responsible for the small differences in wetting and drying characteristics. It further implies that the morphological variation seen in the field is not an adaptation to the conditions near the coast but, rather, is the imposed result of a permanently moist, cool, and salty environment."]
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Keywords: ECOLOGY/ RAMALINA/ CALIFORNIA/ WATER RELATIONS/ PHOTOSYNTHESIS/ CO2 FIXATION/ GROWTH/ POPULATIONS/ GRADIENTS
Abstract: 1 table. 3 figures. [CO2 uptake and water content were studied at sites in California. "At the inland site, CO2 fixation was concentrated in the rainy winter season and very little CO2 fixation took place during the hot summers. In contrast, fog and high atmospheric humidity that frequently occur during summers at the coast provided sufficient moisture for frequent photosynthetic activity, thus resulting in intermittent activity throughout the year."]
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Keywords: ECOLOGY/ RAMALINA/ CALIFORNIA/ WATER RELATIONS/ PHOTOSYNTHESIS/ TRANSPLANTS/ GROWTH/ POPULATIONS/ GRADIENTS
Abstract: 1 table. 4 figures. ["The comparison showed that thallus water content of the two morphological forms was not significantly different when atmospheric humidity was low. In a humid atmosphere, however, the coastal samples maintained a slightly higher hydration level than the inland samples. This resulted in slightly higher photosynthetic rates when water content was low. At higher hydration levels, the inland samples photosynthesized at a higher rate than the coastal samples. It is possible that these differences are an effect of increased salt load in coastal thalli."]
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Keywords: PHOTOSYNTHESIS/ MODELS/ RAMALINA/ CALIFORNIA/ ECOPHYSIOLOGY/ CO2 UPTAKE/ WATER RELATIONS
Abstract: 1 table. 1 figure. [Study of net CO2 uptake to thallus water content on two forms of Ramalina menziesii from California. "A mathematical description of the response curve was based on a piecewise nonlinear regression model, and biologically meaningful parameters were derived. The model was interpreted in terms of interacting resistance components to CO2 uptake."]
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Keywords: POPULATIONS/ ECOLOGY/ RAMALINA/ WATER RELATIONS/ CARBON GAIN/ PHOTOSYNTHESIS/ CALIFORNIA
Abstract: 3 tables. 2 figures. [Experiments support the new hypothesis that the reticulations in growth form of Ramalina menziesii are not adaptations for more effiecient water absorption. "Water vapor uptake accounts for only an estimated 11% of gross annual carbon gain, but is likely to contribute greatly to respiratory losses during the night. Hence, it is very unlikely that so elaborate an adaptation would develop for such a questionable benefit."]
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Keywords: PARMELIACEAE/ NEW TAXA/ XANTHOPARMELIA/ ARIZONA/ MEXICO
Abstract: [New: Xanthoparmelia maricopensis sp. nov.; X. oleosa (Elix & Armstrong) Elix & Nash, comb. nov.; X. neorimalis (Elix & Armstrong) Elix & Nash, comb. nov. The new species is reported from various sites in the southwestern United States and northern Mexico. Xanthoparmelia neorimalis has been found in Mexico and X. oleosa is reported from Mexico and Arizona.]
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[ET: 1038]
Keywords: SALT LOADING/ ECOPHYSIOLOGY/ RAMALINA/ CALIFORNIA
Abstract: 3 tables. 3 figures. [Study on Ramalina menziesii from coastal California showed no relationship between rates of CO2 exchange between specimens with high or low salt concentrations, nor was there any correlation with individual trees within one coastal site compared with one inland site. Artificial manipulation of NA+ content did not change rates of CO2 exchange. "These results imply that the large variability in photosynthetic rates that is present in R. menziesii must be due to factors other than salinity."]
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Keywords: PHOTOSYNTHESIS/ RAMALINA/ ECOPHYSIOLOGY/ CO2 EXCHANGE/ CALIFORNIA
Abstract: 3 figures. 1 table. [Study of specimens from a coastal area (Point Lobos) and an inland site (Hastings) in California. "This study by itself shows significant differences between R. menziesii collected at Point Lobos and that collected at Hastings. These differences exist primarily in the photosynthetic apparatus with almost none found in the respiratory responses." Authors also conlcude, " ... the explanation for the strict coastal distribution of R. menziesii and the explanations of the gradient in its morphology from coastal sites to sites slightly inland may not depend on knowing very much about the details of the responses of gas exchange to the physical environment but rather on factors which have large-scale effects on the magnitude of real growth rates in the field, such as salt exposure, canopy type, and the duration of wetting."]
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Keywords: FLAVOPARMELIA/ PARMELIACEAE/ ECUADOR/ SOUTH AMERICA/ NEW TAXA
Abstract: 1 figure. [New: Flavoparmelia ecuadoriensis sp. nov.]
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[ET: 1040]
Keywords: SOUTH AMERICA/ XANTHOPARMELIA/ PARMELIACEAE/ NEW TAXA/ KEY/ ARGENTINA/ ECUADOR
Abstract: 6 figures. [New: Xanthoparmelia adleri sp. nov., X. argentinensis sp. nov., X. cotopaxiensis sp. nov., X. ferraroiana sp. nov., X. villamiliana sp. nov., and X. wrightiana sp. nov., X. farinosa (Vainio) comb. nov. The new taxa and the new reports are from Argentina, Ecuador and Peru.]
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[ET: 1041]
Keywords: PARMLIEACEAE/ HYPOTRACHYNA/ CANOPARMELIA/ PARAPARMELIA/ NEW TAXA/ AUSTRALIA/ SOUTH AFRICA/ XANTHOPARMELIA/ NAMIBIA
Abstract: 6 figures. [New: Hypotrachyna colensoica Hale, Nash & Elix, sp. nov.; Paraparmelia norlobaridonica Nash & Elix, sp. nov.; P. olivetorica Nash & Elix, sp. nov.; P. xanthomelanoides Elix & Nash, sp. nov.; Xanthoparmelia bicontinens Elix & Nash, sp. nov.; X. shebaiensis Nash & Elix, sp. nov. Thirty additional Parmeliaceae are listed as new reports for southern Africa.]
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[ET: 1039]
Keywords: TRENTEPOHLIA/ TREBOUXIA/ COLD RESISTANCE/ ROCCELLACEAE/ MEXICO/ ECOPHYSIOLOGY/ ALGAE/ PHOTOBIONTS
Abstract: 1 table. 3 figures. [Six hour cold treatments of -5 to -78 C. "From these results and previous publications it is inferred that lichens in general from the Roccellaceae, a family characterized by species with Trentepohlia, are more susceptible to frost than lichens with Trebouxia." The results help to explain the general distribution pattern of the Roccellaceae.]
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Keywords: COLD RESISTANCE/ UMBILICARIA/ NIEBLA/ DENDROGRAPHA/ ECOPHYSIOLOGY/ TRENTEPOHLIA
Abstract: 1 figure. ["Lichens are quite frost resistant in comparison with other plant groups. Nevertheless, a wide range in degree of frost resistance exists among species, the most frost susceptible of which are apparently the Trentepohlia-containing species."]
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Keywords: CHEMISTRY/ DEPSIDES/ DIMELAENA/ ERIODERMA
Abstract: Several formulae. ["The new depsides 3-chlorostenosporic acid, 3-chloroperlatolic acid and subsphaeric acid have been detected in Dimelaena lichens and the structures of the metabolites have been established by unambiguous synthesis. Wrightiin (methyl 3-chloroevernate), a depside from Erioderma wrightii, has also been synthesized by using similar methodology."]
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[ET: 441]
Keywords: GENERAL
Abstract: [General introduction to the biology of the lichen-forming fungi and bryophytes.]
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Keywords: CALIFORNIA/ PHYSIOLOGY/ SALINITY/ DENDROGRAPHA/ PSEUDOCYPHELLARIA/ EVERNIA/ RAMALINA/ PHOTOSYNTHESIS/ RESPIRATION
Abstract: 3 figures. 2 tables. ["Sensitivity to salinity varied widely among 12 Californian lichen species occurring along a coastal to inland gradient, with the degree of sensitivity being approximately proportional to the distance from the coast where the species grew." Authors also conclude, "The results of the experiments with different solutions at equal osmotic potentials indicate that the sensitive species are responding to both osmotic and salt ion effects. These species may provide a good system for investigating mechanisms involved in purely osmotic versus ionic effects."]
[Edit/Delete] [Upload PDF/URL] [ET: 1656]
Keywords: FUMIGATIONS/ SO2/ AIR POLLUTION/ ZINC/ HYDROGEN FLUORIDE
Abstract: 4 tables. 2 figures. ["By non-parametric correlation analysis significant agreement among the various scales is shown and this strongly supports the inference that lichens actually do respond to sulfur dioxide. For other air pollutants, data are currently insufficient to establish precise sensitivity scales. However, it is demonstrated that pollutant concentrations measured in the field are sufficiently high to adversely affect species that are demonstrably sensitive to fumigation experiments with air pollutants such as ozone, hydrogen fluoride and zinc."]
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Keywords: REVIEW
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Keywords: AIR POLLUTION/ GENERAL/ REVIEWS
Abstract: Many illustrations. [Compendium of 12 articles on the uses of lichens and bryophytes in the study and monitoring of air quality both in North America and Europe. Individual articles are listed separately in this bibliography.]
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Keywords: ABSORPTION/ SO2/ AIR POLLUTION
Abstract: 3 figures. 2 tables. ["Analysis indicates that mosses in all habitats are potentially 100 to 1000 times stronger SO2 sinks on a dry weight basis than are vascular plants. Similarly one well studied arctic lichen is estimated to absorb well over 100 times as much SO2 as arctic vascular plants. Adjustments for variability in moss or lichen water contents reduce absorption estimates, but estimates still exceed vascular plant absorption estimates by 100 times."]
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Keywords: AIR POLLUTION/ CO2 EXCHANGE/ NITRATE
Abstract: 1 fig.
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Keywords: EXSICCAT/ ARIZONA/ MEXICO/ ASU/ HERBARIA
Abstract: [Labels for nos. 51-100 in this exsiccat. Most of the specimens are from the U.S.A. and Mexico.]
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Keywords: METAL POLLUTION/ HEAVY METALS TOLERANCE/ REVIEW
Abstract: 1 table. [Review with many references. "Perhaps with the rapid development of plant molecular biology and the recent successful demonstration of gene flow in lichens, the degree to which genetically based tolerance exists in lichens will become demonstrated in the future."]
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Keywords: LECANORA/ MEXICO/ SONORA/ OAXACA/ NEW TAXA
Abstract: 1 plate. [New: Lecanora sonorae sp. nov. from Sonora and Oaxaca, Mexico.]
[Edit/Delete] [Upload PDF/URL] [ET: 1219]
Keywords: XANTHOPARMELIA/ COLORADO/ CHEMOTYPES/ GROWTH RATES/ HABITAT SELECTION/ ECOLOGY
Abstract: 4 tables. 4 figures. [Study conducted in the Colorado Front Range on Xanthoparmelia lineola, X. subdecipiens and three other chemotypes. "Recognition of the chemotypes as distinct species is supported by differences in annual radial growth under uniform conditions at a transplant locality, and differences in habitat selection along an environmental transect."]
[Edit/Delete] [Upload PDF/URL] [ET: 146]
Keywords: SEASONAL VARIATION/ RAMALINA MENZIESII/ CALIFORNIA/ METALS/ TRANSPLANTS/ AIR POLLUTION
Abstract: 4 figures. 4 tables. [Transplant study in California in relation to air pollution levels. "Total concentration of most elements did not exhibit distinct seasonal patterns but the higher concentrations exceeded background levels by factors of 1.3-3.7, depending on the element. In contrast, the elements in the leachates at the control and the polluted site exhibited distinct seasonal patterns with higher concentrations generally present in summer than in winter. These elemental patterns reflected not only atmospheric deposition patterns, but also intracellular release of elements as injury occurred and to a lesser extent accumulation of marine aerosols and soil particulates."]
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Keywords: CALIFORNIA/ RAMALINA/ GROWTH PATTERNS/ BRANCHING/ ECOLOGY/ TRANSPLANTS
Abstract: 1 table. 9 figures. ["We used a nondestructive sampling technique to estimate seasonal and annual linear growth of the inland form transplanted within an inland site and to a coastal site. Growth at the inland site was concentrated in the fall and winter months when precipitation occurred; growth at the coastal site was nearly constant through the first year of the study. Some genetic differences appeared to exist between morphological types, but their responses to the environment were plastic."]
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Keywords: BIOMASS/ ECOLOGY/ CALIFORNIA/ RAMALINA/ ANNUAL TURNOVER
Abstract: 2 tables. 2 figures. [Study conducted in central coastal California. "Ramalina menziesii represented an average of 94% of total epiphytic lichens by weight. Ramalina biomass was estimated to turn over 29% per yr and as a consequence this lichen contributed 13% N, 4% P, 7% K, 1% Ca, 3% Mg, and 8% Na of the annual canopy nutrient turnover. Although the study area is much drier than those of other similar studies, R. menziesii contributed as much to biomass and nutrient turnover as other epiphytic lichens from wetter locations."]
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Keywords: RAMALINA/ CALIFORNIA/ TRANSPLANTS
Abstract: 1 figure. [Transplant studies were conducted in California. "Thus both environmental and genetic controls may be affecting the morphology and physiology of this species."]
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Keywords: OMPHALORA/ NEW TAXA/ OMPHALODIUM/ PARMELIACEAE/ NEW MEICO/ ARIZONA/ COLORADO
Abstract: 1 table. 2 figures. [New: Omphalora Nash & Hafellner gen. nov. and O. arizonicum (Tuck. ex Willey) Nash & Hafellner comb. nov. "Differences in anatomy, morphology, pseudocyphellae type, pigmentation and cell wall chemistry, and ascal dehiscence provide the primary justification for the new genus."]
[Edit/Delete] [Upload PDF/URL] [ET: 3279]
Keywords: WATER RELATIONS/ PHOTOSYNTHESIS/ RESPIRATION/ PHYSIOLOGY/ SALINITY/ CALIFORNIA/ RAMALINA/ PSEUDOCYPHELLARIA/ EVERNIA
Abstract: 1 table. 2 figures. [Study of photosynthetic and respiratory rates was conducted on Ramalina menziesii, Dendrographa minor, Evernia prunastri, and Pseudocyphellaria anthraspis from California by changing water potential through desiccation or osmotic stress using sea salt or sorbitol solutions. "These species provide a model system to differentiate the effect of atmospheric desiccation and osmotic stress on lichen metabolism, and to study the interaction of drought per se with other stress factors such as salt and high light."]
[Edit/Delete] [Upload PDF/URL] [ET: 1657]
Keywords: AIR POLLUTION/ FLUORIDES/ NITRATE/ SULFUR DIOXIDE
Abstract: 3 fig. 1 tab. [Transplant experiments show a decline in chlorophyll content and net photosynthesis associated with the accumulation of 23 ions, particularly nitrate and fluoride.]
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[ET: 767|7]
Keywords: EPIPHYTIC/ LITTER FALL/ MINERAL CYCLING
Abstract: 2 fig. 4 tab. [Epiphytic lichens are believed to be important in capturing nutrients from wet deposition, occult precipitation, sedimentation, impaction and gaseous uptake. "Most nutrients captured by these processes represent new nutrient inputs that would otherwise not be intercepted by the ecosystem."]
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Keywords: AIR POLLUTION/ BIOINDICATORS
Abstract: Lichens are well known as sensitive indicators of air pollution, particularly for sulfur dioxide. In part, this is related to their unique biology. Evidence supporting this assertion goes back well over 100 years and is based on extensive field and laboratory studies. In general, these studies reinforce each other, but for oxidants the data are not entirely consistent, and consequently require further work. At the least, lichens appear to be less sensitive to oxidants than vascular plants. Acid precipitation effects are closely related to SO2 effects. The mechanistic basis for SO2 effects is briefly reviewed. The extreme sensitivity of lichens to SO2 is partially related to their ability to absorb more SO2 for a given concentration than typical vascular plants. The use of lichens as long-term integrators of elemental deposition patterns is well established, but their use for monitoring dry deposition has only recently been recognized. Air pollutants adversely impact not only growth, reproductive potential, and morphology, but also a wide variety of physiological processes, which also becomes reflected in ultrastructural changes. The impact of organic pollutants on lichens is largely undocumented and is a prime area for future work, even though much work remains to be accomplished with the traditionally recognized air pollutants
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[ET: 1042]
Keywords: AIR POLLUTION/ COLORADO/ MESA VERDE NATIONAL PARK
Abstract: 1 fig. [Reports 150 species.]
[Edit/Delete] [Upload PDF/URL] [ET: 1037]
Keywords: LECANORA/ NORTH AMERICA
Abstract: 4 figures [Two species are recognized in North America.]
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[ET: 1222]
Keywords: CALIFORNIA/ FLORISTICS
Abstract: 6 fig. 5 tab. [Over one hundred species are reported, thirty of which are new for California. Includes data on frequency and relative cover.]
[Edit/Delete] [Upload PDF/URL] [ET: 1223]
Keywords: LICHEN PARASITES/ LICHENICOLOUS
Abstract: [Presents an annotated list of fifty-eight lichenicolous taxa from North America. New: Lichenochora xanthoriae Triebel & Rambold sp. nov., Sphaerellothecium subtile Triebel & Rambold sp. nov., Arthonia subfuscicola (Lindsay) Triebel comb. nov., Stigmidium congestum (Koerb.) Triebel comb. nov. New to North America: Abrothallus peyritschii, A. prodiens, Adelococcus alpestris, Arthonia clemens, A. epiphyscia, A. glaucomaria, A. subfuscicola, Cercidospora epicarphinea, Dactylospora deminuta, Epilichen stellatus, Karschia inops, Lichenoconium pyxidatae, L. xanthoriae, Lichenodiplis lecanorae, Peridothelia grandiuscula, Polycoccum galligenum, Polysporina lapponica, Pyrenidium actinellum, Rinodina insularis, Skyttea elachistosphora, Sphaerellothecium abditum, Stigmidium congestum, S. fuscatae, S. tabacinae, Vouauxiomyces truncatus.]
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[ET: 1443]
Keywords: PSILOPARMELIA/ SOUTH AFRICA/ SOUTH AMERICA
Abstract: 13 fig. 1 tab. ["The genus Psiloparmelia Hale has its center of diversity in the high Andes Mountains of South America, but also occurs in the mountains of southern Africa." A total of twelve species is recognized; descriptions and a key are provided. New: P. denotata* sp. nov., P. dichotoma* sp. nov., P. diffractaica* sp. nov., P. flavobrunnea (Müll. Arg.) comb. nov., P. hypostictica* sp. nov., P. norstictica* sp. nov., P. pustulata* sp. nov., P. salazinica* sp. nov., P. sorediosa* sp. nov., P. subcrustosa* sp. nov.]
[Edit/Delete] [Upload PDF/URL] [ET: 2305]
Keywords: ARIZONA/ EXSICCAT
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Keywords: AIR POLLUTION/ CHLOROPHYLL/ CHLOROPHYLL CONTENT/ DOSE-RESPONSE/ PHOTOSYNTHESIS/ RESPIRATION/ SO2
Abstract: 3 fig. 3 tab.
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Keywords: BIATORELLA/ GYPSUM
Abstract: [Biatorella clauzadeana, an obligate gypsophilous species described from Spain, is reported from Mexico and New Mexico.]
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Keywords: MEXICO/ PELTULA/ SONORAN DESERT
Abstract: 8 fig. 1 tab. [New: Peltula sonorensis sp. nov.]
[Edit/Delete] [Upload PDF/URL] [ET: 2743]
Keywords: AIR POLLUTION/ BIOINDICATION/ FLORISTICS
Abstract: 1 appnd. [Discussion of the processes and value of baseline floristic studies in using lichens as bioindicator.]
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Keywords: NORTH AMERICA/ UMBILICARIA
Abstract: 9 fig. [New: Umbilicaria americana sp. nov. This new species is segregated from the North American representation of U. vellea. Taxonomic notes on seven other similar species are also provided, along with a key for all nine species.]
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Current date: 2024.04.25.OK