Notes: On sandstone in arid grassland setting. Thallus not visible, apothecia without thalline margin, convex, dark reddish brown, well spaced. Specimen not collected, but will be visited again.
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(Question posed at observation 274298, and answered here)
It doesn’t seem to me Protoblastenia, though it can be; Seems more like a Caloplaca to me. You said in the notes that the thallus is not visible, but the middle photo shows that it exists and is a yellowish powdery. On the other hand, apothecia of Protoblastenia is never so shiny red, it is more dull brown. I think you have to find the specimen and scope it
I wasn’t prepared to collect from rock so I snapped a few photos, but I plan to get back and see if I can extricate a small piece for micro review. From photos, C. arenaria apothecia are flat-topped where these seem to be very convex, almost bullate or rounded.
Created: 2015-10-09 20:33:09 PDT (-0700)
Last modified: 2015-10-09 20:33:23 PDT (-0700)
Viewed: 49 times, last viewed: 2017-06-20 20:50:48 PDT (-0700)