Collection location: Serra de São Mamede, Portugal [Click for map]
According to my reference the two species C. ryssoleum and C. subnigrescens are very similar and can be easily confused. The latter is very common in the country and is mainly corticolous, while the former in mainly saxicolous and relatively uncommon. Both are ridged postulate, lack isidia and are usually fertile, which is not the case of the specimens of this observation. Therefore to reach a conclusion about the classification one has to use other features. In this case I chose C. ryssoleum due to habitat, of silícea sloping walls of rock surfaces and seepage waters, which is the natural one for C. ryssoleum.
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sum(score * weight) /
(total weight + 1)