Collection location: Thoiry, France [Click for map]
Found under oak, hornbeam, fir.
Adding some micro-details:
The first micro-shot is the edge of the gill at 400x in KOH. The cheilocystidia are clavate and thin walled, and dense on a non-fertile edge. Pleurocystidia are similar, but rare, not numerous.
The second micro-shot is of the cap surface at 400x in KOH. The cap surface is a hymeniderm, of globose to ellipsoid elements, pigmented and smokey.
The third micro-shot is of spores from the gill at 1000x in KOH. The spores are sub-globose, smooth, without a germ pore. The apr. size is 6.5 × 5.5 um.
Putting this together, with the yellow stipe, this is Pluteus romellii. Intersting, that microscopically, this is rather similar to Pluteus nanus, which you can see here http://mushroomobserver.org/50869. It seems the important features here are really macroscopic.
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