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Thanks, Jason!
By: Thomas Stoughton (Tstou10)
2019-02-26 02:24:13 JST (+0900)

Will be trying my luck with mico on lichens this year, and incorporating them into PSH.

Could be, but it also looks exactly like C. luteum
By: Jason Hollinger (jason)
2019-02-26 02:05:58 JST (+0900)

Easy to put the question to rest by looking at spores. Or even algae. I think Coenogonium all have Trentepohlia instead of Trebouxia - look for the little golden oil drops in Trentepohlia. But spores are easiest. Caloplaca (and almost species in the Teloschistaceae) have distinctive polarlocular spores, which is to say 1-septate spores with a very thick septum penetrated by a narrow canal. Coenogonum have normal 1 or more septate spores with thin septae.

Looking at other obsies on MO…
By: Thomas Stoughton (Tstou10)
2019-02-26 01:58:40 JST (+0900)

Caloplaca seems more promising… something I’m missing?