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Fletcher, Purvis, and Coppins in the discussion of Aspicilia in “The Lichens of Great Britain and Ireland” (Smith et al., 2009, p.182): “Species with lobate or placodioid thalli have been considered by some authors to be a separate genus, Lobothallia.”
Learning a lot by following your series of observations, zaca!
… I encountered a specimen similar to Aspicilia but with radial lobes. I came to the genus Lobothallia after consulting the “stridvall” webpage, where only two species are presented L. radiosa and L. melanaspis, the latter being quite different from my specimen.
In the meantime, I saw that in the Sonoran Desert Lichens Checklists three species are referred: L. alphoplaca, L. praeradiosa and L. radiosa. Their descriptions are available from CNALH. After read these descriptions, I am more convinced that my specimen is a L. radiosa. In fact, is the only one where the green colour is mentioned for the upper-surface, which is a characteristic mark of my specimen. In addition, the description of apothecia and discs (where the species mainly differ) match completely, and I quote:
“Apothecia: usually numerous, mostly densely crowded centrally, long remaining immersed, finally adnate to broadly sessile, 0.5-1.5 mm in diam., often compound or confluent and irregular in outline disc: red-brown to gray-brown, brownish black or almost black, at first concave to almost urceolate, then plane, usually epruinose …”.
Thus I am even more convinced of my proposal for the species of the specimen under consideration.
Thanks, Jason, for your comment.
Created: 2011-04-13 22:21:08 BST (+0100)
Last modified: 2011-04-13 22:21:10 BST (+0100)
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