Observation 188720: Lichen P. Micheli
When: 2014-11-16
0 Sequences

on granodiorite used as barrier;

without permit only allowed collect a few apothecia (mushrooms)

photos compromised as forgot tripod that day; very attractive to me, so wanted to identify, but depending on how important should only spend so much time on a lichen

epilithic thallus in some places but mostly without;

in field thinking Lecidea, e.g. L. laboriosa;

section apothecium thinking Porpidia;

paraphyses extremely coherent in H2O and KOH, which made difficult to see detail and particularly get good iodine rx tholus;

is there a method to loosen up coherent paraphyses in section or squash?


interested in black apothecia in center
what appears might be thallus is quartz and feldspar (see 8th image RD15483 d full size)
image at full size clearly see pale grey rimose thallus associated with the black apothecia
image at full size don’t see thallus
lecanorine with dark disk lichen at lower left looks interesting (pale lichen Lecanora polytropa)
see notes – don’t trust this

Proposed Names

83% (1)
Eye3 Eyes3
Recognized by sight: obviously a lichen, but which one
Used references: McCune, Bruce (2007) Miscellaneous Keys to Microlichens of the Pacific Northwest of North America; Smith, C.W., Aptroot, A., Coppins, B.J., Fletcher, A., Gilbert, O.L., James, P.W. and Wolseley, P.A. (2009) The Lichens of Great Britain and Ireland; Thomson, J.W. (1997) American Arctic Lichens, 2. The Microlichens
Based on microscopic features: hymenium 45 µm;

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
This looks like Lecidea to me
By: Jason Hollinger (jason)
2014-11-27 19:34:00 CST (-0600)

That ascus stain could well be lecidea-type. I find that L. laboriosa is always difficult to get the paraphyses to separate even in K. Best plan is to do super-thin section, but then risk damaging asci, so it’s a trade-off. This microscopy looks perfectly in line with photos I have. I’m not surprised you weren’t able to find spores, that’s also not uncommon, esp. if you only have a few apothecia.

My opinion: safest name is L. laboriosa. There’s no way to increase confidence in any of the alternatives.

Created: 2014-11-16 12:57:03 CST (-0600)
Last modified: 2014-11-16 13:00:04 CST (-0600)
Viewed: 41 times, last viewed: 2017-09-01 10:12:30 CDT (-0500)
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