Observation 67699: Caloplaca Th. Fr.

When: 2011-04-22

Collection location: Davis, California, USA [Click for map]

Who: Byrain

No specimen available

Growing on the sidewalk in front of my house, lichens like this are rather common in this habitat around here.


Proposed Names

28% (1)
Recognized by sight: Looks similar to this observation 65524 (http://mushroomobserver.org/65524?q=4VxT)

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Add Comment
Maybe not the same
By: Jason Hollinger (jason)
2011-05-20 11:49:39 EDT (-0400)

The other one has a thin yellowish thallus visible, I’d say. This one has no visible thallus (all that’s visible is the apothecia). Could be C. arenaria or one of several similar species. According to the photos in Lichens of North America, arenaria has very reddish apothecia. I have no idea if that is typical or required.

Definitive ID requires careful observation of the spores (size and width of septum), paraphyses (number of round inflated cells at the tips in particular), and sometimes details about the rim and exciple (I’m not so clear on all this yet).