Observation 10146: Crepidotus applanatus var. globigera
When: 2008-08-10
Herbarium specimen reported

Notes: Found on spruce logs. Hygrophanous caps, and pelucid striate margins, light colored and lacking dark fibers on cap.

9/7/2008 – Getting these under the scope. Looking at them closer, there were a number of slightly different collections from rotting spruce logs on this day. Some very light and translucent striate, some light brown, some solid white not translucent, and one that had orange margins. Looking at the four different collections I made, they are all the same species, so I’ve put them together in this observation, and the light brown ones can be seen in obs. 10145.

Now for the scope details:

The first micro-shot here is of surface hyphae at 400x in Meltzer’s. The hyphae are light, not strongly pigmented, lightly textured, with clamp connections.

The second micro-shot is of a gill edge at 400x in Meltzer’s. Here the cheilocystidia can be seen, and are blunt and thick, not branched, not wavy. No pleurocystidia were obs., although the basidia are separated by spacer cells and a few basidia are ellongated, making it a little uncertain, but the ellogated basidia could be seen with 4 sterigma, so they were not cystidia. The basidia were obs as being 4-spored.

The third micro-shot is of spores from the cap surface at 1000x in Meltzer’s. Here the spores are globose, punctate, non-dextrinoid and inamyloid. The rough ave. diameter is 6-7 um.

Putting this together, and looking the monograph of North American Species of Crepidotus I find that the best species name for this is Crepidotus applanatus var. globigera. There is also Crepidotus hygrophanus which looking at the description, I can’t tell them much apart… C. hygrophanus was listed as only on hardwoods, and the other on hardwoods and rarely conifers, so that suggests it is not C. hygrophanus. Although C. hygrophanus type location was Lake Placid, and that was not so far away. I’m going to go with the one that can be on conifer wood, and is more common with a wider distribution.

I guess these look just like Crepidotus applanatus, but differ in that the spores are larger than 6 um in diameter, where C. applanatus are about 5 um in diameter on ave. These clearly have the larger spores.

Proposed Names

29% (1)
Eye3
Recognized by sight
86% (1)
Eye3 Eyes3
Used references: Hesler, L.R. & Smith, A.H. (1965). North American Species of Crepidotus
Based on microscopic features: Clamp con. obs., non-pigmented surface hyphae when young, thick blunt cheilocystidia, no pleurocystidia, globose punctate spores ave. size larger than 5 um.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2008-08-28 23:38:15 CDT (-0400)
Last modified: 2008-09-07 15:14:34 CDT (-0400)
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