Observation 12801: Xanthoria (Fr.) Th. Fr.

When: 2008-10-17

Collection location: Marin Center, San Rafael, California, USA [Click for map]

Who: Nathan Wilson (nathan)

No specimen available

Seen at the Bioneers conference at the Marin Center.



Proposed Names

57% (1)
Recognized by sight
84% (1)
Recognized by sight: No question: orange apothecia on a small foliose lichen like this is definitely Xanthoria (or the relatively new segregate genus Xanthomendoza).
56% (1)
Recognized by sight: I see no sign of rhizines anywhere. That together with the relatively broad lobes suggests X. parietina. With abundant rhizines it would be Xanthomendoza, probably X. hasseana, since you’re fairly close to the coast. (Sorry, I had mistakenly called it X. elegans, which has much narrower lobes — average 1 mm or less comapred to 2 mm or more. Also _X. elegans is typically higher elevation this far south.)

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I see a Lecanora hagenii lurking in there, too…
By: Jason Hollinger (jason)
2008-10-18 01:55:41 CDT (-0400)

The white-rimmed discs that the Xanthoria is overgrowing is almost certainly Lecanora hagenii, a very common species in urban settings. One can’t be certain, of course, without sectioning it and checking apothecial details, such as presence of, size, distribution and solubility of crystals, but this has the distinctive “eroded”, powdery look typical of urban L. hagenii that’s growing in full sun. Actually, where Xanthoria is growing, I’d almost expect to find L. hagenii on the same tree if I looked long enough.

Created: 2008-10-18 00:41:36 CDT (-0400)
Last modified: 2008-10-18 00:41:36 CDT (-0400)
Viewed: 64 times, last viewed: 2018-06-30 11:44:54 CDT (-0400)