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Data set(s): RLL + Mattick + Supplement
Author: Crittenden

  • Crittenden, PD 1975: Nitrogen fixation by lichens on glacial drift in Iceland. - New Phytol. 74: 41-49. [RLL List # 92-15 / Rec.# 3702]
    Keywords: ICELAND/ NITROGEN FIXATION/ GLACIAL DRIFT/ PHYSIOLOGY
    Abstract: 5 tab. 2 fig.
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  • Crittenden, PD/ Kershaw, KA 1978: A procedure for the simultaneous measurement of net CO2-exchange and nitrogenase activity in lichens. - New Phytol. 80: 393-401. [RLL List # 100 / Rec.# 3698]
    Keywords: CO2 EXCHANGE/ TECHNIQUE/ ENZYME/ NITROGENASE/ PHYSIOLOGY/ ECOLOGY
    Abstract: 4 figures.
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  • Crittenden, PD/ Kershaw, KA 1978: Discovering the role of lichens in the nitrogen cycle in boreal-arctic ecosystems. - The Bryologist 81: 258-267. [RLL List # 101-19 / Rec.# 3699]
    Keywords: CANADA/ NITROGEN FIXATION/ STEREOCAULON/ NORTHWEST TERRITORIES/ NITROGENASE
    Abstract: [Data from studies of the nitrogen fixing capabilities of Stereocaulon paschale mats in the Northwest Territories "... suggest that simple predictive models are not yet able to accurately describe levels of nitrogenase activity in nature and that estimates of N-input on an annual or seasonal basis may be precarious."]
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  • Crittenden, PD/ Kershaw, KA 1979: Studies on lichen-dominated systems. XXII. The environmental control of nitrogenase activity in Stereocaulon paschale in spruce-lichen woodland. - Canadian Journal of Botany 57: 236-254. [RLL List # 103-16 / Rec.# 3700]
    Keywords: STEREOCAULON/ NORTHWEST TERRITORIES/ CANADA/ NITROGENASE/ NITROGEN FIXATION/ SEASONALITY
    Abstract: 4 tables. 12 figures. [Study conducted on samples from Northwest Territories, Canada, showed that "...while nitrogenase activity in S. paschale at any point in time was dependent upon concurrent environmental conditions, it also was strongly influenced by pretreatment: both winter frost and thermal stress during summer droughts impeded recovery of nitrogenase activity following the onset of ameliorative conditions. It is suggested that a large fraction of the total annual N assimilation by S. paschale in drier, continental subarctic habitats may be achieved in summer during a few comparatively short episodes of suitable moisture conditions."]
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  • Crittenden, PD 1983: The role of lichens in the nitrogen economy of subarctic woodlands: nitrogen loss from the nitrogen-fixing lichen Stereocaulon paschale during rainfall. - In: Lee, JA/McNeill, S/Rorison, IH (eds.): Nitrogen as an Ecological Factor. Blackwell Scientific Publications, Oxford, London, pp. 43-68. [RLL List #  / Rec.# 3703]
    Keywords: ARCTIC/ CLADINA/ NITROGEN CYCLE/ NITROGEN FIXATION/ STEREOCAULON
    Abstract: 9 fig. 1 plate [Study compares the nitrogen contributions of Stereocaulon paschale and Cladonia stellaris during natural rainfall events near Kevo in Finnish Lapland.]
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  • Crittenden, PD 1989: Nitrogen relations of mat-forming lichens. - In: L. Boddy, R. Marchant & D. J. Read (eds.): Nitrogen, Phosphorus and Sulphur Utilization by Fungi. Cambridge University Press, Cambridge, pp. 243-268. [RLL List # 137 / Rec.# 3705]
    Keywords: CLADONIA/ NITROGEN/ STEREOCAULON/ MINERAL NUTRIENTS
    Abstract: 12 figures. 3 tables. [Detailed review with comparisons to ectomycorrhizae. Both symbioses exploit periodic nutrient flushes, store nutrients in fungal tissues, and remobilize stored reserves to meet growth requirements of the photobiont.]
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  • Oliver, E/ Crittenden, PD/ Beckett, A/ Brown, DH 1989: Growth of lichen-forming fungi on membrane filters. - Lichenologist 21(4): 387-392. [RLL List #  / Rec.# 13850]
    Keywords: CULTURE/ MYCOBIONT/ TECHNIQUES
    Abstract: 2 fig. [Discusses advantages of growing mycobionts on durapore membrane filters overlaying a defined agar medium.]
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  • Crittenden, PD", (ed.) 1990: British Lichen Society Bulletin. No. 66. Summer 1990. - . 42 pp. [RLL List # 141 / Rec.# 3695]
    Keywords: BRITISH LICHEN SOCIETY/ NEWSLETTER
    Abstract: [News of activities of members of the British Lichen Society.]
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  • Crittenden, PD (ed.) 1991: British Lichen Society Bulletin. - . 45 pp. [RLL List #  / Rec.# 3682]
    Keywords: NEWSLETTER
    Abstract: [News about the British Lichen Society and its members; includes an article on churchyard lichens and another on new, rare or interesting British lichens. Reported new to Britain: Bispora lichenum, Bacidia igniarii, Buellia uberior, B. violaceofusca, Rinodina mniaraea var. cinnamomea, Staurothele geoica.]
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  • Crittenden, PD (ed.) 1991: British Lichen Society Bulletin. - . 44 pp. [RLL List #  / Rec.# 3683]
    Keywords: GREAT BRITAIN/ NEWSLETTER
    Abstract: [News and brief articles, several of which are cited separately in this list. New to Britain: Acarospora chlorophana, Blarneya hibernica. New to England: Micarea globulosella, Microcalicium disseminatum, Ptychographa xylographoides.]
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  • Crittenden, PD 1991: Ecological significance of necromass production in mat-forming lichens. - Lichenologist 23(3): 323-331. [RLL List #  / Rec.# 3706]
    Keywords: DOMINANCE/ NECROMASS/ NUTRIENT RECYCLING/ SUCCESSION
    Abstract: 2 fig. ["Marked vertical gradients in concentrations of N, P and K in thalli of mat lichens, together with results of N budget studies in Cladonia stellaris and Stereocaulon paschale, suggest that these key elements may be recycled internally to fund new growth at the apices."]
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  • Crittenden, PD/ Porter, N 1991: Lichen-forming fungi: potential sources of novel metabolites. - Trends in Biotechnology 9(12): 409-414. [RLL List #  / Rec.# 3701]
    Keywords: BIOTECHNOLOGY/ MEDICINE/ MYCOBIONT CULTURE
    Abstract: 3 fig. 2 tab.
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  • Crittenden, PD (ed.) 1992: British Lichen Society Bulletin. - . 80 pp. [RLL List # 148 / Rec.# 3684]
    Keywords: GREAT BRITAIN/ NEWSLETTER
    Abstract: [Includes news, items of general interest, and brief articles, one of which is cited separately in this list. New to Britain: Parmelia submontana, Lecidea exigua, Stigmidium hageniae, Cladonia asahinae, Lecidella patavina, Thelidium aeneovinosum, Buellia badia.]
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  • Crittenden, PD (ed.) 1992: British Lichen Society Bulletin. - . 56 pp. [RLL List # 150 / Rec.# 3685]
    Keywords: BRITAIN/ NEWSLETTER
    Abstract: [News and several brief articles (cited separately). This issue includes obituaries for Emanuel Rudolph and Dougal Swinscow. New to Britain: Bacidia myrtillicola, Parmelia submontana.]
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  • Crittenden, PD (ed.) 1993: British Lichen Society Bulletin. - . 60 pp. [RLL List # 152 / Rec.# 3686]
    Keywords: GREAT BRITAIN/ NEWSLETTER
    Abstract: [News and brief articles from the members of the society. A separate supplement to this issue is a new checklist of lichens of Great Britain and Ireland (cited separately). New to Britain: Carbonea assimilis, Lecanora pannonica, Leptogium byssinum, Lichinodium sirosiphoideum, Lopadium coralloideum, Rhizocarpon ochrolechiae, Rimularia sphacelata, Skyttea tephromelarum.]
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  • Crittenden, PD (ed.) 1993: British Lichen Society Bulletin. - . 73 pp. [RLL List # 154 / Rec.# 3687]
    Keywords: CHURCHYARDS/ GREAT BRITAIN/ NEWSLETTER
    Abstract: [News about the British Lichen Society and its members; includes several notes on the churchyard lichens project, a proposal for a new definition of the term microlichen, a brief article on Lecanora pannonica and its distribution in Great Britain, and another on new, rare or interesting British lichens. New to Britain: Absconditella annexa, Acarospora durietzii, Arthonia almquistii, Dactylospora attendenda, D. australis, Lecanora navarrensis, Lichenochora inconspicua, Mycoporum hippocastani, Parmelia protomatrae, Sarcopyrenia cylindrospora, Sphaerellothecium minutum, Verrucaria carnea, Vezdaea stipitata.]
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  • Crittenden, PD (ed.) 1994: British Lichen Society Bulletin. No. 74. Summer 1994. - . 80 pp. [RLL List # 156 / Rec.# 3688]
    Keywords: GREAT BRITAIN/ NEWSLETTER
    Abstract: [News from the British Lichen Society and its members; also includes several brief articles (cited separately), as well as a note on the "Churchyards Project" and a list of new or interesting British lichen records. New to British Isles: Absconditella lignicola, Micarea curvata, M. marginata, Miriquidica liljenströemii, Rhizocarpon cinereonigrum, Sagediopsis aquatica.]
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  • Crittenden, PD (ed.) 1994: British Lichen Society Bulletin. - . 52 pp. [RLL List # 157 / Rec.# 3689]
    Keywords: CHURCHYARDS/ GREAT BRITAIN/ NEWSLETTER/ NOMENCLATURE
    Abstract: [News from the British Lichen Society and its members. Also includes several brief papers (cited separately), a note about the nomenclatural changes resulting from the new ICBN (Tokyo), a report on the churchyard lichens project, a brief bibliography pertinent to British lichenology, and notes on new or rare lichens for the British Flora. New to the British Isles: Rinodina flavosoralifera, Xanthoria fulva.]
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  • Crittenden, PD/ Kalucka, I/ Oliver, E 1994: Does nitrogen supply limit the growth of lichens?. - Cryptogamic Botany 4: 143-155. [RLL List # 156 / Rec.# 3697]
    Keywords: ARCTIC/ BOREAL/ C/ N RATIOS/ CARBON RATIOS/ MAT-FORMING/ NITROGEN FIXATION/ PHOSPHORUS
    Abstract: 6 fig. 3 tab. [Detailed review of the role of nitrogen in lichen growth in oligotrophic boreal-arctic environments. "Data reviewed are largely consistent with the proposal that non-N2-fixing mat-forming lichens are N-limited. This possibity is discussed in relation to N2-fixation and water availability as potential factors affecting lichen growth."]
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  • Kytöviita, M-M/ Crittenden, PD 1994: Effects of simulated acid rain on nitrogenase activity (acetylene reduction) in the lichen Stereocaulon paschale (L.) Hoffm., with special reference to nutritional aspects. - New Phytologist 128(2): 263-271. [RLL List # 157 / Rec.# 10767]
    Keywords: ACETYLENE REDUCTION/ ACID RAIN/ NITROGEN FIXATION/ NITROGENASE/ NUTRITION
    Abstract: 4 fig. 2 tab.
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  • Crittenden, PD (ed.) 1995: British Lichen Society Bulletin. - . 68 pp. [RLL List # 160 / Rec.# 3690]
    Keywords: BLS/ NEWSLETTER
    Abstract: [News from the Society and its members; includes several short papers (cited herein), several notes on churchyard lichens projects and field meetings, a brief bibliography pertinent to british lichens, and a list of new, rare, and interesting lichen records. New to the British Isles: Acremonium lichenicola, Buellia papillata, Lecidea luteoatra, Lepraria boralis, L. elobata, Micarea elachista, Rhizocarpon submodestum, Rinodina colobinoides, R. degeliana, R. fimbriata, Wentiomyces lichenicola.]]
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  • Crittenden, PD (ed.) 1995: British Lichen Society Bulletin. - . 52 pp. [RLL List # 160 / Rec.# 3691]
    Keywords: BLS/ NEWSLETTER
    Abstract: [News from the Society and its members; includes several short papers (cited herein) including a history of the society, a note on the churchyard lichens project, a brief bibliography pertinent to british lichens, and a list of new, rare, and interesting lichen/lichenicolous fungi records. New to the British Isles: Lecidea lapillicola, Opegrapha rotunda, Phaeosporobolus alpinus, Sphaerellothecium propinquellum, Stigmidium congestum.]
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  • Crittenden, PD/ David, JC/ Hawksworth, DL/ Campbell, FS 1995: Attempted isolation and success in the culturing of a broad spectrum of lichen-forming and lichenicolous fungi. - New Phytologist 130(2): 267-297. [RLL List # 160 / Rec.# 3696]
    Keywords: ASCOSPORE GERMINATION/ LICHENICOLOUS/ MYCOBIONT CULTURE
    Abstract: 1 tab. 1 appendix ["Isolation into pure culture was attempted on 1183 species (2238 specimens) of lichen-forming and lichenicolous fungi from diverse ecosystems and systematic groups (covering 14 ascomycete orders, 77 families and 280 genera), in 20 countries. Four hundred and ninety three species (42%) were successfully isolated either from ascospores (or basidiospores, or conidia) or photobiont-free fragments from thallus macerates."]
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  • Crittenden, PD (ed.) 1996: British Lichen Society Bulletin. No. 79. Winter 1996. - . 1-60 pp. [RLL List # 165 / Rec.# 3692]
    Keywords: GREAT BRITAIN/ NEWSLETTER
    Abstract: [News and notes from society members. This issue also contains news from IAL3 in Salzburg. New to the British Isles: Lecidea haerjedalica, L. mucosa (previously listed as a synonym of L. turgidula), L. promiscens, L. promiscua, L. syncarpa, Phylliscum demangeonii, Pseudephebe minuscula, Pyrrhospora rubiginans.]
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  • Crittenden, PD (ed.) 1996: British Lichen Society Bulletin. - . 76 pp. [RLL List # 164 / Rec.# 3693]
    Keywords: BLS/ NEWSLETTER
    Abstract: [News from the Society and its members; includes several short papers (cited herein) and notes on field meetings, reservoir drawdowns, lichen reinvasion of London, the role of computers and the internet in lichenology, and a list of new, rare, and interesting lichens and lichenicolous fungi for the British Isles. New to the British Isles: Cladonia arbuscula ssp. arbuscula, Lichenodiplis lichenicola, Phoma physciicola, Porpidia zeoroides, Scutula solorinaria, Strigula lateralis.]
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  • Crittenden, PD 1996: The effect of oxygen deprivation on inorganic nitrogen uptake in an Antarctic macrolichen. - Lichenologist 28(4): 347-354. [RLL List # 164 / Rec.# 3707]
    Keywords: NH4/ NITROGEN/ NITROGEN SOURCES/ NITROGEN UPTAKE/ NO3/ OXYGEN DEPRIVATION/ USNEA
    Abstract: 3 fig. [Study conducted on Usnea sphacelata.]
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  • Hyvärinen, M/ Crittenden, PD 1996: Cation ratios in Cladonia portentosa as indices of precipitation acidity in the British Isles. - New Phytologist 132(4): 521-532. [RLL List # 163 / Rec.# 9002]
    Keywords: ACID RAIN/ AIR POLLUTION/ CATIONS/ CLADONIA/ ELEMENT ANALYSIS/ HEATHLAND/ PH
    Abstract: 7 fig. 2 tab.
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  • Crittenden, PD (ed.) 1997: British Lichen Society Bulletin. No. 80. Summer 1997. - . 1-72 pp. [RLL List # 167 / Rec.# 3694]
    Keywords: BORRER, W/ CHURCHYARDS/ DOBBS, CG/ GREAT BRITAIN/ NEWSLETTER
    Abstract: [News, notes and opinions from society members, as well as several short articles, cited separately herein. Additionally, this issue contains an obituary for C. Geoffrey Dobbs, a brief biography of William Borrer and further news on the churchyard lichens project. New to British Isles: Aspicilia moenium, Cladonia alpina, Dermatocarpon deminuens, Lecanora ochroidea, Lithothelium aff. phaeosporum, Macrophomina pseudeverniae, Melaspilea bagliettoana, Niesslia lobariae, Opegrapha glaucomaria, Stigmidium arthoniae, S. epiramalina, S. pumilum, S. tabacinae.]
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  • Crittenden, PD 1998: Nutrient exchange in an Antarctic macrolichen during summer snowfall-snow melt events. - New Phytologist 139(4): 697-707. [RLL List # 174 / Rec.# 3708]
    Keywords: ANTARCTIC/ NUTRIENT EXCHANGE/ NUTRIENT FLOW/ NUTRIENT RELEASE/ USNEA
    Abstract: 6 fig. 2 tab. ["Concentrations of NH4+, NO3-, PO4---, K+, Ca++ and Mg++ in snow meltwater resulting from summer snow showers were monitored before and afer its passage through monospecific stands of the Antarctic macrolichen Usnea sphacelata R. Br."]
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  • Hyvärinen, M/ Crittenden, PD 1998: Growth of the cushion-forming lichen, Cladonia portentosa, at nitrogen-polluted and unpolluted heathland sites. - Environmental and Experimental Botany 40: 67-76. [RLL List # 179 / Rec.# 9003]
    Keywords: ACID RAIN/ AIR POLLUTION/ BIOMASS/ CLADONIA/ GROWTH RATES/ HEATHLAND/ NITROGEN DEPOSITION
    Abstract: 4 fig. 2 tab.
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  • Hyvärinen, M/ Crittenden, PD 1998: Phosphate uptake in Cladonia portentosa. - Lichenologist 30(3): 297-301. [RLL List # 171 / Rec.# 9004]
    Keywords: CLADONIA/ MINERAL UPTAKE/ PHOSPHATE/ PHOSPHATE EXCHANGE
    Abstract: 2 fig.
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  • Hyvärinen, M/ Crittenden, PD 1998: Relationships between atmospheric nitrogen inputs and the vertical nitrogen and phosphorus concentration gradients in the lichen Cladonia portentosa. - New Phytologist 140(3): 519-530. [RLL List # 174 / Rec.# 9005]
    Keywords: AIR POLLUTION/ CLADONIA/ NITROGEN/ NUTRIENT CYCLES/ PHOSPHORUS
    Abstract: 9 fig. 5 tab.
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  • Murtagh, GH/ Dyer, PS/ Crittenden, PD 1998: Sex and the single lichen. - In: : Sixth International Mycological Congress (IMC6). Abstracts. , pp. 85. [RLL List # 182 / Rec.# 21695]
    Keywords: GRAPHIS/ PHAEOGRAPHIS/ POLYMORPHISM/ RAPD ANALYSIS/ REPRODUCTIVE STRATEGIES/ SEXUAL REPRODUCTION
    Abstract: [Abstract from presentation at IMC6, held in Jerusalem, August 23-28, 1998.]
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  • Murtagh, GJ/ Dyer, PS/ McClure, PC/ Crittenden, PD 1999: Use of randomly amplified polymorphic DNA markers as a tool to study variation in lichen-forming fungi. - Lichenologist 31(3): 257-267. [RLL List # 175 / Rec.# 13238]
    Keywords: AXENIC CULTURE/ DNA/ GENETIC VARIABILITY/ MOLECULAR BIOLOGY/ RAPD ANALYSIS
    Abstract: 3 fig. [Study of RAPD markers in axenic cultures of species of Graphis and Phaeographis. "DNA extracted from whole thalli of G. scripta was also subjected to RAPD-PCR but the fingerprints produced differed from those given by axenic cultures of the mycobiont. Therefore difficulties of interpretation may arise when whole thalli are used in RAPD analyis."]
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  • Case, N/ Crittenden, PD 2000: A comparative study of growth rate and metabolite yield in axenic cultures of lichen-forming fungi. - In: : The Fourth IAL Symposium, Progress and Problems in Lichenology at the Turn of the Millennium. Universitat de Barcelona, Barcelona, pp. 61. [RLL List # 181 / Rec.# 20926]
    Keywords: AXENIC CULTURE/ GROWTH RATES/ MYCOBIONT/ MYCOBIONT CHEMISTRY/ MYCOBIONT CULTURE/ SEM
    Abstract: [Abstract from the International Association for Lichenology's fourth symposium, held in Barcelona, Spain, 3-8 September 2000.]
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  • Crittenden, PD 2000: Aspects of the ecology of mat-forming lichens. - Rangifer 20(2-3): 127-139. [RLL List # 187 / Rec.# 23197]
    Keywords: ACID RAIN/ ALLELOPATHY/ GRAZING/ GROWTH/ NITROGEN FIXATION/ NUTRIENT CYCLING/ TRAMPLING
    Abstract: 5 fig. [From "The Tenth Arctic Ungulate Conference, 9-13 August, 1999, Tromso, Norway.]
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  • Crittenden, PD 2000: Editorial. - Lichenologist 32(3): 205. [RLL List # 179 / Rec.# 3709]
    Keywords: HISTORY/ JOURNAL
    Abstract: [Comment on the retirement of D. H. Brown from his 12 year role as Senior Editor of the Lichenologist.]
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  • Dyer, PS/ Murtagh, GJ/ Crittenden, PD 2000: Use of DNA fingerprinting to investigate thallus individuality and population variation within Graphis scripta, Ochrolechia parella and Xanthoria elegans. - In: : The Fourth IAL Symposium, Progress and Problems in Lichenology at the Turn of the Millennium. Universitat de Barcelona, Barcelona, pp. 132. [RLL List # 181 / Rec.# 20971]
    Keywords: DNA/ DNA FINGERPRINTING/ GENETIC DIVERSITY/ INDIVIDUAL/ MOLECULAR BIOLOGY
    Abstract: [Abstract from the International Association for Lichenology's fourth symposium, held in Barcelona, Spain, 3-8 September 2000.]
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  • Hyvärinen, M/ Crittenden, PD 2000: 33P translocation in the thallus of the mat-forming lichen Cladonia portentosa. - New Phytologist 145: 281-288. [RLL List # 179 / Rec.# 9006]
    Keywords: CLADONIA/ NUTRIENT TRANSFER/ PHOSPHORUS
    Abstract: 5 fig. ["The results are consistent with the hypothesis that P is recycled within podetia of mat-forming lichens, migrating from degrading basal regions upwards to the growing apices following a source-sink relationship."]
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  • Hyvärinen, M/ Crittenden, PD 2000: Influence of air-drying and storage at -15°C on cellular distributions of cations in Cladonia portentosa. - Graphis Scripta 12(1): 9-11. [RLL List # 182 / Rec.# 21572]
    Keywords: CATIONS/ CLADONIA/ TECHNIQUES/ TEMPERATURE
    Abstract: 1 fig.
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  • Murtagh, GJ/ Dyer, PS/ Crittenden, PD 2000: Sex and the single lichen. - Nature 404: 564. [RLL List # 182 / Rec.# 21761]
    Keywords: BREEDING SYSTEMS/ GENETIC DIVERSITY/ HETEROTHALLISM/ HOMOTHALLISM/ SEXUAL REPRODUCTION/ SEXUAL STRATEGIES
    Abstract: 1 fig. [Molecular study of genetic diversity of single-spore progeny and (indirectly) of breeding systems in Graphis scripta and Ochrolechia parella. "In both species, these markers revealed that spores from the same ascoma are genetically uniform, providing compelling evidence of homothallism."]
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  • Dyer, PS/ Murtagh, GJ/ Crittenden, PD 2001: Use of RAPD-PCR DNA fingerprinting and vegetative incompatibility tests to investigate genetic variation within lichen-forming fungi. - Symbiosis 31: 213-229. [RLL List # 186 / Rec.# 22916]
    Keywords: DNA/ GENETIC VARIABILITY/ GENETICS/ MOLECULAR BIOLOGY/ PCR/ REVIEW
    Abstract: 4 fig. [Review article.]
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  • Kytöviita, M-M/ Crittenden, PD 2002: Seasonal variation in growth rate in Stereocaulon paschale. - Lichenologist 34(6): 533-537. [RLL List # 189 / Rec.# 23821]
    Keywords: GROWTH RATES/ MASS/ SEASONAL VARIATION/ STEREOCAULON
    Abstract: 1 tab. ["Mass increases in S. paschale were readily measurable and showed clear seasonal variation."]
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  • Murtagh, GJ/ Dyer, PS/ Furneaux, PA/ Crittenden, PD 2002: Molecular and physiological diversity in the bipolar lichen-forming fungus Xanthoria elegans. - Mycological Research 106(11): 1277-1286. [RLL List # 190 / Rec.# 23978]
    Keywords: CLIMATE/ CRYPTIC SPECIES/ GENETIC DIVERSITY/ METABOLISM/ MOLECULAR PHYLOGENY/ PHYSIOLOGY/ TEMPERATURE/ XANTHORIA
    Abstract: 5 fig. 2 tab. ["Genetic and physiological diversity was assessed in isolates of the lichen-forming fungus Xanthoria elegans originating from a range of geographic localities and climatic regimes including polar and temperate regions. In vitro cultures were established and isolates examined by production of multi-locus RAPD markers and by sequence comparison of the ITS region of the rDNA tandem repeat unit."]
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  • Walker, TR/ Crittenden, PD/ Young, SD 2003: Regional variation in the chemical composition of winter snow pack and terricolous lichens in relation to sources of acid emissions in the Usa River basin, northeast European Russia. - Environmental Pollution 125(3): 401-412. [RLL List # 195 / Rec.# 25705]
    Keywords: ARCTIC/ ATMOSPHERIC DEPOSITION/ BIOINDICATION/ NITROGEN DEPOSITION/ RUSSIA/ SNOW
    Abstract: 9 fig. 1 tab.
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  • Crittenden, PD/ Llimona, X/ Sancho, L 2004: Nitrogenase activity in Thyrea spp. - preliminary results. - In: Randlane, T/Saag, A (eds.): Book of Abstracts of the 5th IAL Symposium. Lichens in Focus. Tartu University Press, pp. 44. [RLL List # 197 / Rec.# 26430]
    Keywords: HETEROCYSTS/ NITROGEN FIXATION/ NITROGENASE/ THYREA
    Abstract: [Abstract from "The 5th Symposium of the International Association for Lichenology" held in Tartu, Estonia, 16-21 August 2004.]
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  • Ellis, CJ/ Crittenden, PD/ Scrimgeour, CM 2004: Soil as a potential source of nitrogen for mat-forming lichens. - Canadian Journal of Botany 82: 145-149. [RLL List # 199 / Rec.# 27151]
    Keywords: CLADONIA/ NITROGEN/ UPTAKE
    Abstract: 2 fig. 1 tab.
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  • Seymour, FA/ Crittenden, PD/ Dickinson, MJ/ Paoletti, M/ Montiel, D/ Dyer, PS 2004: Breeding systems in the lichen-forming fungal genus Cladonia. - In: Randlane, T/Saag, A (eds.): Book of Abstracts of the 5th IAL Symposium. Lichens in Focus. Tartu University Press, pp. 41. [RLL List # 197 / Rec.# 26420]
    Keywords: BREEDING SYSTEMS/ CLADONIA/ DNA/ SEX
    Abstract: [Abstract from "The 5th Symposium of the International Association for Lichenology" held in Tartu, Estonia, 16-21 August 2004.]
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  • Ellis, C. J./ Crittenden, P. D./ Scrimgeour, C. M./ Ashcroft, C. J. 2005: Translocation of 15N indicates nitrogen recycling in the mat-forming lichen Cladonia portentosa. - New Phytologist 168(2): 423-434. [RLL List # 201 / Rec.# 28035]
    Keywords: CLADONIA/ ECOLOGY/ NUTRIENT CYCLING/ GLYCINE/ AMMONIUM/ NITROGEN TRANSLOCATION/ SCOTLAND
    Abstract: [Study conducted in a heathland in Scotland. "This recurrent relocation of resource in a source-to-sink relationship is compelling evidence of recycling: of N allocated to structural and metabolically functional components of physiologically active cells within vegetative mycelium (and algal cells), subsequently remobilized and transported via cytoplasmic pathways into younger cells."
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  • Seymour, F. A./ Crittenden, P. D./ Dyer, P. S. 2005: Sex in the extremes: lichen-forming fungi. - Mycologist 19(2): 51-58. [RLL List # 202 / Rec.# 28336]
    Keywords: SEXUAL REPRODUCTION/ ANTARCTICA/ ECOPHYSIOLOGY/ BREEDING SYSTEMS
    Abstract: [General review of the evolutionary implications for persistence of sexual reproduction in lichens under Antarctic conditions.
    [Edit/Delete] [Upload PDF/URL] [ET: 3876]

  • Seymour, FA/ Crittenden, PD/ Dickinson, MJ/ Paoletti, M/ Montiel, D/ Cho, L/ Dyer, PS 2005: Breeding systems in the lichen-forming fungal genus Cladonia. - Fungal Genetics and Biology 42: 554-563. [RLL List # 200 / Rec.# 27527]
    Keywords: BREEDING SYSTEMS/ CLADONIA/ HOMOTHALLISM/ RAPD ANALYSIS
    Abstract: 5 fig. 1 tab. [Study of three species: Cladonia floerkeana, C. galindezii and C. portentosa.]
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  • Walker, T. R./ Habeck, J. O./ Karjalainen, T. P./ Virtanen, T./ Solovieva, N./ Jones, V./ Kuhry, P./ Ponomarev, V. I./ Mikkola, K./ Patova, E./ Crittenden, P. D./ Young, S. D./ Ingold, T. 2006: Perceived and measured levels of environmental pollution: interdisciplinary research in the subarctic lowlands of northeast European Russia. - Ambio 35(5): 220-228. [RLL List # 205 / Rec.# 29327]
    Keywords: POLLUTION/ EUROPEAN RUSSIA/ REINDEER LICHENS/ CLADONIA/ HEAVY METALS
    Abstract: ["Vorkuta and its environs suffered the worst impacts, with significant metal loading and alkalization in lakes and topsoils, elevated metals and cations in terricolous (reindeer) lichens, and changes in vegetation communities."
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  • P. D. Crittenden, X. Llimona and L. G. Sancho 2007: Lichenized unicellular cyanobacteria fix nitrogen in the light. - Canadian Journal of Botany 87: 1003-1006. [RLL List # 210 / Rec.# 29923]
    Keywords: NITROGEN FIXATION/ CYANOBACTERIA/ THYREA/ DIURNAL PERIODICITY
    Abstract: [Study on Thyrea girardii and T. confusa showed a diurnal pattern of nitrogen fixation. "We suggest carbon flow to the fungal symbiont reduces the potential for nitrogenase activity in the dark."]
    – 10.1139/B07-092

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  • Seymour, F. A./ Crittenden, P. D./ Wirtz, N./ Øvstedal, D. O./ Dyer, P. S./ Lumbsch, H. T. 2007: Phylogenetic and morphological analysis of Antarctic lichen-forming Usnea species in the group Neuropogon. - Antarctic Science 19(1): 71-82. [RLL List # 206 / Rec.# 29213]
    Keywords: NEUROPOGON/ ANTARCTICA/ USNEA/ BIPOLAR LICHENS/ PARMELIACEAE
    Abstract: [Study 400 specimens of 5 taxa using morphological and molecular (ITS and RPB1) characters. "Phylogenetic analyses indicated that species circumscription in the Neuropogon group needs revision, with the principal species being non-monophyletic. None of the morphological characters, or groups of characters, used in this study proved to be completely unambiguous markers for a single species. However, axis thickness was supported as being informative for the identification of monophyletic lineages within the group."
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  • P. S. Dyer and P. D. Crittenden 2008: Antarctic lichens: life in the freezer. - Microbiology Today 35(2): 74-77. [RLL List # 217 / Rec.# 30703]
    Keywords: ANTARCTICA/ GENERAL/ POPULAR
    Abstract: [Popular article on biology and diversity of lichens in Antarctica.]
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  • C. Schoch, G.-H. Sung, F. López-Giráldez, J. P. Townsend, J. Miadlikowska, V. Hofstetter, B. Robbertse, B. Matheny, F. Kauff, Z. Wang, C. Gueidan, R. M. Andrie, K. Trippe, L. M. Ciufetti, A. Wynns, E. Fraker, B. P. Hodkinson, G. Bonito, J. Z. Groenewald, M. Arzanlou, G. S. De Hoog, P. W. Crous, D. Hewitt, D. Pfister, K. Peterson, M. Gryzenhout, M. J. Wingfield, A. Aptroot, S.-O. Suh, M. Blackwell, D. M. Hillis, G. W. Griffith, L. A. Castlebury, A. Rossman, H. T. Lumbsch, R. Lücking, B. Büdel, A. Rauhut, P. Diederich, D. Ertz, D. M. Geiser, K. Hosaka, P. Inderbitzin, J. Kohlmeyer, B. Volkmann-Kohlmeyer, L. Mostert, K. O'Donnell, H. Sipman, J. D. Rogers, R. Shoemaker, J. Sugiyama, R. C. Summerbell, W. Untereiner, P. R. Johnston, S. Stenroos, A. Zuccaro, P. S. Dyer, P. D. Crittenden, M. S. Cole, K. Hansen, J. M. Trappe, R. Yahr, F. Lutzoni and J. W. Sapatafora 2009: The Ascomycota tree of life: a phylum-wide phylogeny clarifies the origin and evolution of fundamental reproductive and ecological traits. - Systematic Biology 58(2): 224-239. [RLL List # 216 / Rec.# 31448]
    Keywords: ASCOMYCETE PHYLOGENY/ LICHENIZATION/ LECANOROMYCETES/ MOLECULAR PHYLOGENETICS/ ANCESTRAL CHARACTER RECONSTRUCTION
    Abstract: [Results of a 6-gene, 420 species maximum likelihood phylogenetic analysis. "All lichen taxa are restricted to "Leotiomyceta" and are members of Candelariales, Lecanoromycetes, "Dothideomyceta," Eurotiomycetes, and Lichinomycetes. In contrast to previous studies, these analyses support multiple origins of lichenization events with the loss of lichenization as less frequent and limited to terminal, closely related species."]
    – 10.1093/sysbio/syp020

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  • T. R. Walker, P. D. Crittenden, V. A. Dauvalter, V. Jones, P. Kuhry, O. Loskutova, K. Mikkola, A. Nikula, E. Patova, V. I. Ponomarev, T. Pystina, O. Rätti, N. Solovieva, A. Stenina, T. Virtanen and S. D. Young 2009: Multiple indicators of human impacts on the environment in the Pechora Basin, north-eastern European Russia. - Ecological Indicators 9(4): 765-779. [RLL List # 215 / Rec.# 31591]
    Keywords: RUSSIA/ AIR POLLUTION/ HEAVY METAL/ BIOINDICATION/ OIL AND GAS INDUSTRIES/ ENVIRONMENTAL CHEMISTRY/ RUSSIAN ARCTIC/ FORESTRY
    Abstract: ["Chemistry of lichens, topsoil, lake water and sediments, plus diversity of lichens, birds and aquatic indicators along with landscape analysis were measured at eight sites in the PR [Pechora Region] to access local impacts of oil/gas and forestry operations."]
    – 10.1016/j.ecolind.2008.09.008

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  • E. J. Hogan, G. Minnullina, L. J. Sheppard, I. D. Leith and P. D. Crittenden 2010: Response of phosphomonoesterase activity in the lichen Cladonia portentosa to nitrogen and phosphorus enrichment in a field manipulation experiment. - New Phytologist 186: 926-933. [RLL List # 219 / Rec.# 31934]
    Keywords: PHOSPHOMONOESTERASE/ CLADONIA/ NITROGEN ENRICHMENT/ PHOSPHORUS/ BIOINDICATION/ N:P RATIO/ NITROGEN DEPOSITION/ AMMONIUM/ HEATHLAND LICHENS
    Abstract: [Field study in Scotland over 4 years. "Nitrogen enrichment induces P-limitation in C. portentosa with attendant changes in chemical and physiological characteristics that could be used as sensitive biomarkers with which to detect low levels of N pollution."]
    – 10.1111/j.1469-8137.2010.03221.x

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  • E. J. Hogan, G. Minnullina, R. I. Smith and P. D. Crittenden 2010: Effects of nitrogen enrichment on phosphatase activity and nitrogen:phosphorus relationships in Cladonia portentosa. - New Phytologist 186: 911-925. [RLL List # 219 / Rec.# 31935]
    Keywords: CLADONIA/ SCOTLAND/ ENGLAND/ UNITED KINGDOM/ NITROGEN ENRICHMENT/ PHOSPHATASE ACTIVITY/ N:P RATIO/ NITROGEN DEPOSITION/ PHOSPHORUS
    Abstract: [Experiments on material from various sites in the United Kingdom. "Nitrogen enrichment changes lichen N:P ratios from values typical of N limitation (for example, 10) to those indicative of P limitation (for example, 26) driving upregulation of PME [phosphomonoesterase] activity."]
    – 10.1111/j.1469-8137.2010.03222.x

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    Number of hits shown/total: 59/59.
    Number of records in database: 41416.
    Current date: 2019.04.21.OK