Notes: On old wood ranch fence board in rural Atascadero, valley oak (Quercus lobata) savannah and pastureland.
Mazaedium black. Thallus light yellow green under microscope, comes across as distinctly light green with the naked eye.
Apothecia sessile? Immersed? Exciple thin or thickened at base? This is my first attempt to key this group and my first thought was sessile apothecia and exciple thickened at base which took me to C. pinicola and C. lucidum; the former is somewhat out of documented range and habitat, the latter just doesn’t look right in photos. C. tigillare fits the range and looks right in photos, and reconsideration of the exciple being thin throughout might be correct, although I don’t think I understand “immersed” apothecia…I’m probably not the only one!
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Thanks for the info Jason, maybe after a few more years and a few more specimens I’ll get it!
Look at the small apothecium in the bottom-middle of the third photo, I think that’s the clearest. I think an oblique shot may show the character off better, though.
I was equally (more?) confused about what they really meant by “sessile” and “immersed” in this context. But finally after several years, after seeing a couple specimens of each plus many photos, I believe the key is whether the apothecia are ever immersed. The thallus can erode in age, and the mazaedium itself will extrude upward and make it look for all the world like it’s superficial. Ignore all that! Look for the young apothecia. And I see one which is clearly immersed, the proverbial smoking gun.
Created: 2015-02-01 00:30:53 CET (+0100)
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