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I just don’t trust my intuition with geology yet. Thanks!
It was just a slab separated from its original place in the nature and placed at the entrance to the bike trail. But it’s light color indicates limestone or a relative (you can’t see its color in the photos).
There is a chance it’s a sandstone too. I’ll need to revisit this location and double – check the rock and the lichen.
The margins of the apothecia look black (albeit with a white-pruinose outer coating maybe), so I’m thinking Buellia or… ???
Is this on one of those famous Wisconsin calcareous sandstones? Crusts on calcareous substrates often have pruina.
I wish I had a better suggestion, but this doesn’t look like either. Like you say, Sarcogyne has no thallus at all. And Porpidia albocaerulescens usually has really thin flat apothecia. Without spores to narrow it down… ugh, I can’t bring myself to flip through Brodo just now! There’s gotta be other options…
Created: 2012-11-22 19:20:41 PST (-0800)
Last modified: 2012-11-22 19:24:37 PST (-0800)
Viewed: 46 times, last viewed: 2016-06-21 06:52:07 PDT (-0700)