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The article presents an ecological study of Ysgolion Duon, a mountain cliff in Snowdonia, Wales. The study aims to determine the relation of species distributions on a mountain cliff with environmental factors. Differences in climate between the cliff and surrounding grasslands were studied. Results showed that orloci ordination procedure was able to establish the correlation of species distributions with an environmental gradient from wet eutrophic to dry oligotrophic. The presence of relict species in the flora and the isolation of the cliff from many biotic influences suggests that the vegetation is continuous.