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Fulgensia desertorum is the most frequently reported
By: Jason Hollinger (jason)
2016-03-15 17:26:46 PDT (-0700)

and probably is the one on your list. But I think most reports of F. desertorum are really this species: strongly placodioid / lobed margins, apothecia very rare, often breaking down into “schizidia” in the interior. F. desertorum strictly speaking should be composed of dispersed areoles, appearing to be much more crustose-like. This species is crustose, too, but it gives the appearance of being minutely foliose.

PS. If you happen to remember, try to make note of whether you’re collecting on limestone or on soil near limestone. That’s an extremely important environmental factor for lichens (and plants and mosses and everything else!) Fortunately you can see tiny Collema-like things in the background of these photos, so I think it’s safe to say you were in a calcareous area. Fulgensia and Squamarina are both calciphiles.