Observation 159281: Verrucaria muralis Ach.

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Recognized by sight
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Something close to Verrucaria muralis
By: Jason Hollinger (jason)
2014-05-24 02:38:54 EDT (-0400)

I also get names like V. schindleri (Sonoran Flora) and V. calkinsiana (Ozarks Flora) in other floras, but they’re all very similar, differing in spore size, darkness of the exciple and extent of the involucrellum. I found:

perithecia ~0.2-0.3 mm wide
involucrellum ~50 µm thick, extending halfway down the sides of the exciple
exciple thin but entirely dark even when young
spores up to at least ~22×12 µm (but were too scarce to rely on mature spores floating free of the asci)

Created: 2014-02-06 21:20:28 EST (-0500)
Last modified: 2014-05-24 02:32:36 EDT (-0400)
Viewed: 22 times, last viewed: 2016-10-25 09:04:42 EDT (-0400)
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