Pentecost, A 1980: The lichens and bryophytes of rhyolite and pumice-tuff rock outcrops in Snowdonia, and some factors affecting their distribution. - Journal of Ecology68: 251-267. [RLL List # 107-57 / Rec.# 14313] Keywords: BRITISH ISLES/ NUTRIENT ENRICHMENT/ SAXICOLOUS/ MICROTOPOGRAPHY/ RHYOLITE
Abstract: 8 figures. 7 tables. [The rocks had distinct floras regulated by nutrient enrichment by birds, degree of exposure, water seepage and physiochemical characters of the rocks themselves. "A method for measuring and analysing rock microtopography using the light microscope is described."]
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