Growing on a rock in a dry creek bed which will be filled with water soon.
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I can’t put a genus to either one with confidence, though.
White one: Maybe Lecanora. Would be good to see a clean section of one of the rimmed apothecia in order to see if there is algae in the rim. Also would be good to verify that the spores are colorless, single-celled, ellipsoid things ~10-20 µm long. Spot test (K, C and KC on the white surface) will also probably be required at some point, and in any case will help verify any id we come up with. Presence of crystals in the epihymenium and amphithecium will be harder to diagnose. [edit: just saw the spot tests at the bottom, looks like it could be KC+, which would be remarkable considering its utter lack of yellowish pigmentation, but certainly it is K- and C- which is very helpful]
Dark one with gorgeous black white-rimmed apothecia: I’m thinking Rinodina. This is very easy to verify. The spores should be gray/brown at maturity with two cells and the lumina of the two cells will often have various wall thickenings at various stages of maturity, from angular to circular, with or without thickened tip, constricted septum, and darkened ring around the waist. Getting it to species might be very difficult without access to the recent monograph (and lots of experience diagnosing the exact spore type.) Spot tests are going to be impossible to read in situ, and will almost certainly be negative anyway.
Created: 2011-11-07 06:25:30 EST (-0500)
Last modified: 2011-11-07 06:36:34 EST (-0500)
Viewed: 26 times, last viewed: 2017-06-10 03:43:16 EDT (-0400)