| Re: Xanthoria sp ??
I agree with Jenny that everything posted in this thread is Xanthoria parietina, but this thread well illustrates the difficulty at times of separating the two species.
Microscopically, X. parietina is said to have longer conidia (obtained by a squash of a pycnidium, an orange pimple in the thallus surface), 2.7-3.6 μm in X. parietina, 2.2-2.9 μm in X. polycarpa, but these figures are from an American source (Lindblom, 1997) and I don't know how well they apply to British/European material.
Alan
Last edited by AlanS; 06-04-2009 at 11:39 PM.
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