Observation 64479: Xanthoparmelia (Vain.) Hale

When: 2011-03-17

Collection location: Fair Oaks, California, USA [Click for map]

Who: Byrain

No specimen available

Abundant in a large rock field, growing from many of the rocks.



Proposed Names

85% (1)
Recognized by sight
84% (1)
Recognized by sight: large greenish foliose lichens growing closely-appressed to granitic rocks in bright, exposed situations (probably more than one species in these photos, but would need chemistry and much closer shots to be able to tell for sure)

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Chris Parrish (kitparrish)
2011-03-18 18:06:00 AST (-0400)

Nice sequence of photos! CNALH makes it easy to generate illustrated checklists of lichens known to occur near a given locality, and the system works especially well in better known localities like central California. Here is a checklist for members of the family Parmeliaceae (which contains the genus Xanthoparmelia) known to occur within 90 miles of Fair Oaks, CA (Thanks for the Google map … very helpful). As you can see, there are 10 species of Xanthoparmelia known from near there, but only a few have lobes as broad as those in your photos. Xanthoparmelia novomexicana and perhaps a few others stand out especially. To make further progress it would be good to know the color of the lower cortex (pale creamy, brown, or black) both near the margins and near the center of the thallus, but as Jason points out it may eventually be necessary to study the chemistry to make a species determination in this very large and complex genus. Directions for generating such checklists can be found on MO Observation 56869.

By: Byrain
2011-03-18 03:59:59 AST (-0400)

I’ll come back to these when I have access to a higher powered camera, as these shots are as close as they can go while still being in focus.

Created: 2011-03-18 03:34:13 AST (-0400)
Last modified: 2011-03-18 03:38:20 AST (-0400)
Viewed: 47 times, last viewed: 2017-06-09 08:48:41 AST (-0400)
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