Notes: All micrographs mounted in 5% KOH solution.
|I’d Call It That||3.0||5.42||1||(jason)|
sum(score * weight) /
(total weight + 1)
We can definitely rule out Lecidea because of the brown epihymenium and easily-separated paraphyses. I don’t have my literature with me, remind me in a week if I haven’t commented again. You found one of the common and very annoying problems with rock-dwelling crustose lichens: for some reason they produce very scant quantities of spores. I’m not sure there are any in any of these photos (maybe a few on the left of the second 1000x photo? maybe one of the asci in one of the 1000x photos has spores in it? or is that paraphyses showing through?) It can be maddeningly difficult to scour “acres” of squash prep like these to find just one or two sometimes. Still, if we assume simple spores, this might be enough to go on. I need to check the keys, I just don’t remember the other options at the moment. Rhizocarpon is, at any rate, looking more promising. (Incidentally, the “smoking gun” for Rhizocarpon is an indistinct halo around the spores in an india ink prep. That, and a distinctive ascus structure as seen with very high-quality scope and lugol’s solution stain. But I’ve never succeeded in seeing either, even with specimens of certain id.)
Created: 2011-03-22 01:50:38 CDT (-0400)
Last modified: 2011-03-24 13:10:27 CDT (-0400)
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