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|I’d Call It That||3.0||6.04||1||(Andrew)|
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You’re looking for immersed flasks or beads. Probably with black walls, at least near the tip. It’s not always apparent whether you’re looking at pycnidia or perithecia, sometimes even apothecia can look remarkably perithecioid (e.g., Stictis urceolatum).
Under a microscope you’d want to look for algae inside the perithecium, as well as any structure in the outer wall — is it black all the way around, does it have a second layer outside that, and does the second layer separate from the inner? Also check for changes in color of anything in K. Periphyses? Spore shape and color? Medulla blue or red in Lugol’s, with or without prewash with KOH. Is the algae trebouxioid or trentepohlioid? And so on.
Some of the larger structure you should be able to see even under dissecting scope. Even spore color can be apparent sometimes. Not sure about algae in the hymenium, but you might get lucky (see Staurothele and Endocarpon).
These “medallions” are about the size of half-dollar, and barely perceptable on concrete pad.
Created: 2012-05-31 20:44:35 MST (-0700)
Last modified: 2012-05-31 20:47:57 MST (-0700)
Viewed: 56 times, last viewed: 2017-06-12 23:25:51 MST (-0700)