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Ascaso, C/ Valladares, F 1991: Comparative stereological study of the photobiont of Lasallia hispanica (Frey) Sancho & Crespo and Umbilicaria spodochroa var. carpetana Prov. - Symbiosis 11: 147-162. [RLL List # / Rec.# 1153]
Keywords: ALGAL LAYER/ CHLOROPLASTS/ LASALLIA/ MITOCHONDRIA/ PHOTOBIONT/ PYRENOIDS/ STEREOLOGY/ TREBOUXIA/ UMBILICARIA
Abstract: 2 fig. 5 tab. [The two species examined exhibit significant differences in the percentage of the volume of their algal layers and their photobionts (Trebouxia sp.) differ in the volume of their chloroplasts and mitochondria.]
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Ascaso, C/ Sancho, LG/ Valladares, F 1992: Fine structure of the thalloconidia of the lichen genus Umbilicaria. - Cryptogamie, Bryologie-Lichénologie 13(4): 335-340. [RLL List # 150 / Rec.# 1151]
Keywords: TEM/ THALLOCONIDIA/ UMBILICARIA
Abstract: 7 fig. [TEM study of the thalloconidia in eight species.]
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Valladares, F/ Ascaso, C 1992: Three-dimensional quantitative description of symbiont ultrastructure within the algal layer of two members of the lichen family Umbilicariaceae. - Lichenologist 24(3): 281-297. [RLL List # 149 / Rec.# 19230]
Keywords: CHLOROPLASTS/ LASALLIA/ MYCOBIONT/ PHOTOBIONT/ PYRENOIDS/ STEREOLOGY/ SYMBIONT VOLUME/ ULTRASTRUCTURE/ UMBILICARIA/ UMBILICARIACEAE
Abstract: 5 fig. 3 tab. ["The ultrastructure of the symbionts within the algal layer of Lasallia hispanica and Umbilicaria spodochroa has been investigated by applying stereological techniques to quantify cellular organelles and structures. The stereological parameters calculated were volume density (Vv) and surface density (Sv)....Significant differences between the two lichen species with respect to both symbionts were observed."
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Sancho, LG/ Valladares, F 1993: Lichen colonization of recent moraines on Livingston Island (South Shetland I., Antarctica). - Polar Biology 13: 227-233. [RLL List # 153 / Rec.# 16208]
Keywords: ANTARCTICA/ COLONIZATION/ LICHENOMETRY/ MORAINES/ SOUTH SHETLAND ISLANDS
Abstract: 7 fig. 2 tab. ["The moraine studied, roughly 34 years old, was in an early stage of plant succession. Plant communities were observed only on the boulders at the top of the moraine. They were always composed of a relatively small number of lichen species and with a low coverage of the rock surface."]
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Valladares, F/ Sancho, LG 1993: Biología de las comunidades liquénicas de los posadero rocosos de aves en el Sistema Central español [Biology of the lichen communities of rocky bird perches in the Spanish Sistema Central]. - Rivasgodaya 7: 5-68. [RLL List # 160 / Rec.# 19236]
Keywords: ALTITUDE/ BIRD DROPPINGS/ BIRD PERCHES/ COMMUNITIES/ COMPETITION/ ORNITHOCOPROPHILOUS/ PHYTOSOCIOLOGY
Abstract: 38 fig. 8 tab. [A study based on 102 relevés along an altitudinal gradient at 24 localities.]
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Valladares, F/ Wierzchos, J/ Ascaso, C 1993: Porosimetric study of the lichen family Umbilicariaceae: anatomical interpretation and implications for water storage capacity of the thallus. - American Journal of Botany 80(3): 263-272. [RLL List # 151 / Rec.# 19240]
Keywords: CO2 EXCHANGE/ POIKILOHYDRIC/ THALLUS ANATOMY/ UMBILICARIACEAE/ WATER RELATIONS/ WATER STORAGE
Abstract: 26 fig. 1 tab. ["The pore system within the thalli of 13 lichen taxa belonging to the family Umbilicariaceae has been studied by means of mercury intrusion porosimetry. A characteristic bimodal pore size distribution with a central depression around 0.05 µm of equivalent pore radius was obtained in all lichen samples. However, clear differences were found among the pore size distributions of each taxa." (sic)]
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Ascaso, C/ Valladares, F 1994: Past, present and future methods of quantification in anatomical and ultrastructural studies of lichens. - Cryptogamic Botany 4: 255-261. [RLL List # 156 / Rec.# 1154]
Keywords: LENGTH DENSITY/ METHODS/ NUMERIC DENSITY/ QUANTITATIVE METHODS/ SEM/ STEREOLOGY/ SURFACE DENSITY/ TEM/ ULTRASTRUCTURE/ VOLUME DENSITY
Abstract: 5 fig. 1 tab. [Review article.]
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Sancho, LG/ Valladares, F/ Ascaso, C 1994: Effect of hydration on colour and temperature in thalli of Umbilicariaceae. - Cryptogamic Botany 4(2): 227-232. [RLL List # 158 / Rec.# 16206]
Keywords: COLOR/ HYDRATION/ LASALLIA/ THALLUS COLOR/ THALLUS HYDRATION/ THALLUS TEMPERATURE/ UMBILICARIA/ UMBILICARIACEAE
Abstract: 10 fig.
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Valladares, F/ Ascaso, C/ Sancho, LG 1994: Intrathalline variability of some structural and physical parameters in the lichen genus Lasallia. - Canadian Journal of Botany 72(4): 415-428. [RLL List # 156 / Rec.# 19229]
Keywords: INTRATHALLINE VARIABILITY/ LASALLIA/ MYCOBIONT/ PHOTOBIONT/ STEREOLOGY/ THALLUS ANATOMY/ THALLUS DENSITY/ UMBILICARIACEAE
Abstract: 5 tab. 27 fig. [Intrathalline variability was studied in two species, Lasallia hispanica and L. pustulata. "The study focussed on the thickness of the thallus and its layers, the increase of surface area and volume with hydration, the sample densities in dry and wet states, several stereological parameters (especially the volume and surface density of both symbionts related to each layer and to the thallus as a whole), and the chlorophyll content. Only slight differences were revealed between the two species, but significant intrathalline variation was observed."]
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Valladares, F/ Ascaso, C 1994: Quantitative approach to the fine structure of both symbionts of nine Umbilicaria species. - Protoplasma 178: 168-178. [RLL List # 156 / Rec.# 19231]
Keywords: HAUSTORIA/ MYCOBIONT/ ORGANELLES/ PHOTOBIONT/ PHYCOBIONTS/ PYRENOIDS/ TEM/ ULTRASTRUCTURE/ UMBILICARIA/ VOLUME DENSITY
Abstract: 7 fig. [TEM study. "The stereological parameter Vv (volume density) has been estimated for the most important organelles and cellular structures in order to quantify their volumetric contribution to the cells of both symbionts and to assess their inter- and intraspecific variability."]
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Valladares, F 1994: Form-functional trends in Spanish Umbilicariaceae with special reference to water relations. - Cryptogamie, Bryologie-Lichénologie 15(2): 117-127. [RLL List # 156 / Rec.# 19241]
Keywords: AEROHYGROPHYTIC/ CILIA/ CORTEX/ ESQUIZIDIA/ ISIDIA/ MEDULLA/ PUSTULES/ RHIZOMORPHS/ SPAIN/ UMBILICARIA/ WATER RELATIONS
Abstract: 9 fig. ["Two principal form-functional trends were observed on water relations, depending on the physical state of water available: 1) a little-porous upper surface combined with rhizinomorphs when uptake is as liquid water or 2) a highly hygroscopic upper surface with no rhizinomorphs on the lower surface when the water uptake is as vapour."]
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Valladares, F 1994: Texture and hygroscopic features of the upper surface of the thallus in the lichen family Umbilicariaceae. - Annals of Botany 73: 493-500. [RLL List # 161 / Rec.# 19242]
Keywords: SURFACE TEXTURE/ UMBILICARIACEAE/ UPPER CORTEX/ WATER ABSORPTION/ WATER HOLDING CAPACITY/ WATER RELATIONS/ WATER STORAGE
Abstract: 28 fig. 1 tab. [Study of the thickness and surface texture/wettability of the upper cortex in 20 taxa. "The degree of wettablity was closely related to surface texture but not to cortical thickness. The lichens which possessed the most hygroscopic upper surface (in some cases more so than the filter paper) were those species which usually obtain water as vapour from the air, whereas those species dependent on the substrate for their water had a relatively impermeable upper surface."]
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Current date: 2024.09.13.OK