Observation 65896: Meottomyces Vizzini

When: 2011-01-15

Collection location: Sycamore Grove Park, Livermore, California, USA [Click for map]

Who: Douglas Smith (douglas)

Specimen available

Found by others at the BAMS nature walk. Growing on hardwood leaves.

Perhaps similar to :


The first micro-shot is of the cap surface at 400x in Meltzer’s. The cap is a cutis, with a light thin layer of gelatin, no pileocystidia.

The second micro-shot is of the gill edge in 400x in Meltzer’s. The cheilocystidia are long cylindrical, contorted, in tight clumps. No pleurocystidia were obs., basidia are 4-spored. No reactions obs. to the reagent.

The third micro-shot is of spores from the gill at 1000x in Meltzer’s. The spores are ellipsoid, smooth, very light tan, no germ pore. Many somewhat random shaped. The apr. ave. size is 9 × 4 um.

Not sure what this one is, but posted because of recent discussions over Meottomyces dissimulans/Phaeogalera oedipus. This looks rather similar, in size and stature, veil, brown spore deposits, gill attachment. The difference here is in the spore size, and the cystidia shape and in clumps.

Might be another variable form of this species, or another species in the genus.

Proposed Names

1% (3)
Recognized by sight
Used references
Based on microscopic features
1% (5)
Recognized by sight
30% (2)
Recognized by sight
56% (1)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Didn’t see the date
By: Christian (Christian Schwarz)
2011-04-21 23:46:04 CEST (+0200)

So… hm. Interesting.
Meottomyces looks pretty good. The cystidia shape and clumped character seem to match Tatiana’s description and photos pretty well, don’t they?

By: Douglas Smith (douglas)
2011-04-21 23:21:02 CEST (+0200)

But there isn’t a germ pore, there isn’t a hymeniderm, the section is good. And these are not now, this is from Jan. So, there are a number of reasons here it seems for it not to be an Agrocybe…

Or it could be an Agrocybe
By: Christian (Christian Schwarz)
2011-04-21 22:37:33 CEST (+0200)

But the lack of a germ pore (although that can be hard to see on these light spores)

And lack of a hymeniderm (which can be obscured if the section isn’t good) would pretty much rule that out.

It just looks so much like Agrocybe, and they are out in droves right now…

Created: 2011-04-21 22:09:46 CEST (+0200)
Last modified: 2018-02-01 02:49:59 CET (+0100)
Viewed: 212 times, last viewed: 2018-03-27 15:58:27 CEST (+0200)
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