8/6/2008 – Getting to these -

Looking at these under the microscope now. Along with Psathyrella I wanted to try a few Crepidotus also.

The first micro-shot is of hyphae from the pileus surface at 400x in Meltzer’s. Here there is clearly clamp connections, I’ve been told this is fairly obvious for most Crepidotus, that the clamps in the surface hyphae are large. Also these hyphae are pigmented and nicely textured.

The second micro-shot is of the gill edge at 400x in Meltzer’s. There are cheilocystidia observed here, these are cylindrical, and bent and some wavy, with blunt ends. There are no pleurocystidia observed.

The third micro-shot is of some spores taken from the gill at 1000x in Meltzer’s. I can’t take spores from the stipe apex, since there is no stipe, I need to think of a better way to look at mature spores in these. Here the spores are globose, warted/spiny, brown, non-dextrinoid and inamyloid.

Putting this together and using The North American species of Crepidotus by Hesler and Smith, the species does drop out fairly well, as C. crocophyllus. The one weird bit is that this is a fairly good cap, young and clean and the gill don’t show any of the orange color shown in other sitings.

It is certainly not C. mollis, which was the quick guess from Arora. C. mollis is lacking clamp connections, and the spores are ellipsoid and smooth.

Species Lists


Proposed Names

86% (1)
Used references: The North American species of Crepidotus, Hessler and Smith, 1965
Based on microscopic features: Clamps, no pleurocystidia, globose spiny spores.

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= Observer’s choice
= Current consensus


Add Comment
Orange only in young…
By: Douglas Smith (douglas)
2008-08-06 17:52:25 CEST (+0200)

Well, it was mentioned that the orange gills was only seen in really young caps. They mention that this fades to tan-gray and then brown. But this one looked pretty young. In any case it looks like you can’t make that big a deal of the orange gills for id purposes… It seems more a feature to ignore, then to require for the id.

In the scope at least, with the globose warted spores the species can be found from the monograph, and easily separated from C. mollis.

OK, orange gills apparent in Western material, too.
By: Debbie Viess (amanitarita)
2008-08-06 17:38:54 CEST (+0200)

Perhaps the color is degraded by time and the elements, like is found commonly in amanita species? Or, perhaps future DNA work will elucidate other differences…

Orange color unusual, and only found in young caps!
By: Debbie Viess (amanitarita)
2008-08-06 17:34:04 CEST (+0200)

It threw me off, too, when I collected it at Highlands. Maybe it is a regional difference in the East? Are there photos of the orange cast for Western material, too?

Good observation!