Observation 88087: Lecanora Ach.
When: 2012-02-21
Herbarium specimen reported

Notes: on bark of dead branch Alnus Rubra

this is an area of relatively low air quality (near interstate highway and agriculture)

with http://mushroomobserver.org/obs/88016?q=Brkd and http://mushroomobserver.org/obs/88069?q=Brkd

K neg or very weak; largest apothecia 0.4mm; hymenium ca. 45 micron high; paraphyses simple ca. 1 micron and ca. 2 micron at apices; crystals insoluble in KOH; spores average 10.5 × 6

pycnospores variable length up to ca. 30 microns long and very thin

Jason – ?

Species Lists

Images

200663
image 11mm across
200664
both with KOH
200665
pycnidium 200 × 150 microns
201504

Proposed Names

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Comments

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I get the crystals wrong sometimes
By: Jason Hollinger (jason)
2012-02-28 18:38:16 CST (-0600)

You’d think it was an easy either-or character, but I’ve been corrected several times when I thought it was obvious. Oh well. If the epihymenium is POL+ there are lots of additional options to consider. Ugh.

thanks Jason
By: Richard Droker (wanderflechten)
2012-02-28 17:58:31 CST (-0600)

Thanks Jason. Perhaps it is something akin to L. subrugosa or L. argentata. Thinking I’ll leave it for now, particularly as its such a small specimen.

One of my photos (which I’ll upload) seems to have some crystalline material in the epihymenium (in H2O)

By: Jason Hollinger (jason)
2012-02-21 13:48:25 CST (-0600)

I can’t find any with 1) large insoluble crystals in amphithecium, 2) no crystals or granules in epihymenium, 3) K- thallus. Allow weak K+y, then I find L. subrugosa in BC, or L. subrugosa and L. argentata in Sonoran Flora. Both report larger spores than you do; and the Sonoran Flora doesn’t report conidia for L. subrugosa (it’s rare in southwest, I think).

Created: 2012-02-21 13:26:48 CST (-0600)
Last modified: 2012-02-21 13:34:03 CST (-0600)
Viewed: 44 times, last viewed: 2016-09-20 03:02:09 CDT (-0500)
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