Observation 72995: Lepiota (Pers.) Gray
When: 2011-07-31
Herbarium specimen reported

Notes: Single specimen, growing along paved road, with hemlocks and Douglas firs around. A grisette Amanita was within 1 m too.

Cap 4.5 cm; stem 50 mm long, 5-7 mm thick.

Spore deposit white. Spores amyloid, 6-8 × 4 microns. No cystidia observed.

Proposed Names

-27% (1)
Recognized by sight
61% (2)
Eyes3
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Of course
By: Irene Andersson (irenea)
2011-08-04 01:20:50 PDT (-0700)

Lepiota seems to be a good match, also considering the spore shape. I usually have a hard time with that genus..
Indeed, L. subincarnata looks close. It should have cheilocystidia, although not very conspicious.

Yes, dextrinoid
By: Sava Krstic (sava)
2011-08-03 23:59:38 PDT (-0700)

Irene, thanks for pointing out that the spores are actually dextrinoid. I just didn’t pay attention to the color. In fact, this is the first time I’ve seed a dextrinoid reaction.

For a moment I also thought this might be a Limacella, but couldn’t see that the gill trama was divergent. (And then eliminated Limacella based on the wrong assumption that the spores were amyloid.)

Now, could this mushroom be a Lepiota? Perhaps L. subincarnata?

Dextrinoid spores?
By: Irene Andersson (irenea)
2011-08-03 01:37:08 PDT (-0700)

It looks like reddish brown iodine reaction. I have never seen anything like this, but a couple of possible genera that comes to my mind that can have dextrinoid spores, is Cystodermella and Limacella (it has some resemblance with both).

Two quick attemps to determine the genus
By: Sava Krstic (sava)
2011-08-02 22:35:25 PDT (-0700)

I tried Matchmaker and MykoKey, entering undisputable characters: white elliptical (strongly) amyloid spores, spore size, cap size, and scaly cap surface. MykoKey comes out with Floccularia, Squamanita, Porpoloma, Leucopaxillus, and Pseudoomphalina. Matchmaker returns Floccularia, Leucopaxillus, and Pseudoarmillariella. None of these seems a good match. Any ideas?

Created: 2011-08-01 00:55:19 PDT (-0700)
Last modified: 2011-08-10 16:23:50 PDT (-0700)
Viewed: 133 times, last viewed: 2016-03-30 12:23:19 PDT (-0700)
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