Observation 12757: Peltigera aphthosa (L.) Willd.
When: 2008-10-16
No herbarium specimen

Notes: This very broadly lobed dark green lichen with a white edge also has white depressed dots on the surface, as well as upraised tiny black pines and tiny reddish-brown cup-shaped structures (spore producing?) on older section. Reminds me of Lobaria, but thicker texture than Lobaria I have previously seen. Could just be proximity to Pacific Ocean, I suppose. Reverse is mostly white with black bumps and both black and white rhizimes, growing on top of mosses.

Proposed Names

5% (2)
Eye3
Recognized by sight
84% (1)
Eyes3
Recognized by sight: This is one of the green-algal forms of Peltigera. The black raised dots are cephalodia containing the usual cyanobacteria. The other common green-algal species are P. leucophlebia with crisped margins and P. britannica whose cephalodia are scales instead of lumps. P. aphthosa is a large species complex that hasn’t been fully worked out yet. (Every other time I talk to Trevor Goward it seems he’s changed his mind based on DNA evidence or new specimens.) So I’m happy to just leave it at P. aphthosa!

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2008-10-17 12:48:56 CDT (-0400)
Last modified: 2008-10-17 12:48:56 CDT (-0400)
Viewed: 20 times, last viewed: 2016-03-20 21:07:12 CDT (-0400)