Observation 7234: Conocybe tenera (Schaeff.) Fayod
When: 2007-12-29
Herbarium specimen reported

Notes: Two really little guys, given to me in the hopes they might be Galerina, but pretty quickly, could see they are not.

The first micro-shot is of the pileipellis in radial section (that curled around after cut and mounteded), at 400x in Meltzer’s. The cap surface here is clearly hymeniform, and not a cutis. So this along makes it a Conocybe instead of a Galerina.

The second micro-shot is of the gill edge at 400x in Meltzer’s. The cystidia here are capitate, with fat rounded bottoms (is it ok to say that?). The capitate cystidia make this a Conocybe and not a Pholiotina (it case you want to split off Pholiotina as a genus). Which matches since the stipe does not have an annulus, and I believe Pholiotinas have a small membranous annulus. Like Conocybe filaris is really a Pholiotina.

Anyway, I was thinking at some point I would try to get these to species, but I’m not sure that is going to happen anytime soon, so I thought I would just pops these up here for now.

7/12/2008 – Getting back to these, not sure why I was going through some stuff orgaqnizing, and this one caught my eye. I had looked at this under the scope again on March 23, but never really got around to cleaning it up and getting it organized.

But here are some more micro-shots of this one. The third micro-shot here is of some caulocystidia from the apex of the stipe at 400x in KOH. Here the cystidia can be seen as similar to the cheilocystidia, and also there are no cystidia of other shapes, or fibrous hyphae.

The fourth micro-shot is off some spores from the stipe apex at 1000x in KOH. The spore size from these is 10.20 +/- 0.26 (err 0.13) um, width – 6.89 +/- 0.44 (err: 0.20) um – q : 1.49 +/- 0.08, on 6 spores. Which isn’t that many spores, the caps aren’t that mature, so this will have to be good enough for jazz.

Looking at this, and going to the best source on Conocybe that I have, which is the Flora Agaricina Neerlandica vol. 6, it looks like these are Conocybe tenera. This might be a fairly good match, the spore size gets you to a set of Conocybe (along with having no veil), and it seems that the other Conocybe will have fibrous hyphae on the stipe, or caulocystidia of different shape intermixed with cystidia similar to the cheilocystidia.

So, I’m going to go with this one. Although it does mention that this name has been commonly misapplied for many samples in many herbariums.

Proposed Names

-61% (2)
Recognized by sight
78% (2)
Eye3 Eyes3
Used references: Flora Agaricina Neerlandica vol. 6
Based on microscopic features: Spores larger than 10 um on average, caulocystidia similar to cheilocystidia.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2008-04-03 23:42:02 UTC (+0000)
Last modified: 2008-07-13 03:43:57 UTC (+0000)
Viewed: 146 times, last viewed: 2016-11-20 21:25:19 UTC (+0000)