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I didn’t grab a sample :( . I initially thought it was an Umbilicaria b/c with it’s warty bumps looked so much like the one next door with the apothecia, and just didn’t strike me as a Collema at the time; the photos later deceived me. Such a beautiful rosette it makes. Wish I had a sample to check what’s going on with it. Thank you for the correction Jason :) !!
I’m pretty sure this is U. hyperborea, too, like the other observation, but I’ve U. angulata look like this when really stressed, too. I can see where you’re getting Collema fuscovirens from, because this thing hardly looks like a normal Umbilicaria which are supposed to be attached at a single point in the center. But you should be able to convince yourself that it is Umbilicaria in several ways. First, it might have a gyrose apothecium hidden somewhere in that big mess of tattered thallus(!) Second, it will have a clearly stratified thallus, with at least some white medulla visible if you start disassembling it. The medulla should be C+ pink/red. You can try wetting it, too. Collema should turn gelatinous when hydrated.
Created: 2012-05-30 21:10:06 CDT (-0500)
Last modified: 2012-06-01 14:37:15 CDT (-0500)
Viewed: 54 times, last viewed: 2016-10-23 17:43:59 CDT (-0500)