Observation 73716: Marasmius wynneae Berk. & Broome

When: 2011-07-30

Collection location: Thoiry, France [Click for map]

Who: Douglas Smith (douglas)

No specimen available

Found under spruce and fir.

Third year finding these. Thought they were M. cohaerens at first, but under the scope it is really, really not. At this point, I think they are closest to M. wynneae, but not sure. People please comment if you have any other ideas.

Adding micro details:

The first micro-shot is of the cap surface at 400x in Meltzers. The surface is hymeniform, with globose smooth cells. Also here the pileus context is dextrinoid, the cells are red-brown in the Meltzer’s.

The second micro-shot is of the stipe apex at 400x in KOH. There are numerous caulocystidia, here they are setae-like, fairly thick walled and pointed. They were obs. from the apex to the base.

The third micro-shot is of spores from the stipe apex at 1000x in KOH. The spores are ellipsoid, hyaline, smooth. The apr. size is 10 × 4.5 um.

Also along with this, no hymenal cystidia were obs., no reactions to the reagents in spores or lamellae.

This one seemed to refuse to be id’ed, didn’t really key out in various Marasmius sources. But reading through the notes in the Antonin book on Marasmioid fungi, it seems that these are best matched to M. wynneae. Some of the differences here with the normal discr. is that it should have cheilocystidia at least, the caulocystidia should be more cylindrical and blunt, and the lamellae context should be dextrinoid. But the cheilocystidia are clavate to wavy cyndrical, and I might have missed them in the basidia. Also the desc. has these as off-white and not striate, but in the notes, Antonin mentions the variation of the cap in the species, with colors from brown to grey to white. But it seems the most important feature really is the smooth cells in the cap surface, not broom cells, which gets you to the correct section in Marasmius quickly.

Species Lists



Proposed Names

86% (1)
Eye3 Eyes3
Recognized by sight
Used references: “Maraismioid and Collybioid fungi in Europe”, Antonin, p67
Based on microscopic features: as desc. in the text.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Douglas Smith (douglas)
2011-09-01 16:54:15 EDT (-0400)

Hah! Just looked at my workup last year:


And in that one I saw clavate cheilocystidia! Ok, so there you go… just didn’t see them in the mount for this one…

Created: 2011-08-09 18:54:29 EDT (-0400)
Last modified: 2011-09-01 16:47:41 EDT (-0400)
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