Observation 21552: Lecanora Ach.
When: 2003-09-27
No herbarium specimen

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Recognized by sight
56% (1)
Recognized by sight

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Eye3 = Observer’s choice
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By: Jason Hollinger (jason)
2009-06-02 13:26:23 MDT (-0600)

Beautiful photos! I hate to be so negative, but this is definitely not Dimelaena. There are few lichens with such well-devloped but apparently crustose lobes. Both Lecanora and Xanthoparmelia can do this. The Lecanora muralis group for example — see the photo of L. garovaglii in _Lichens of North America — definitely not yours, but it gives an idea what that group is capable of. I don’t see any examples of nearly-crustose Xanthoparmelia in Brodo’s book, though. Too bad. I’m leaning strongly toward Lecanora because of the shape and color of the apothecia. The two genera are in different families, so there should be some obvious way to tell them apart, but I’m drawing a blank: the spores are the same; maybe the asci stain differently? good luck!; Lecanora can have fairly well-developed cortex in extreme cases, Xanthoparmelia can have barely any rhizines in equally extreme cases. I don’t see any pycnidia, and that’s bad news for Xanthoparmelia

Created: 2009-06-02 12:49:20 MDT (-0600)
Last modified: 2009-06-02 12:49:20 MDT (-0600)
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