Collection location: Forest near Elgin St., Pembroke, Ontario, Canada [Click for map]
These were growing out of a crack in a tall stump. At first it wasn’t clear exactly what they were, but they proved to be relatively ordinary brownish mushrooms with yellow gills. Fibrous veil, maybe Naematoloma sublateritium or something similar.
First two photos: these mushrooms on the fourth. Next two: the same mushrooms on the fifteenth.
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The gills maturing from yellow to brown suggests brown spores.
The yellow gills and cortina suggest Gymnopilus, but the cap seems too smooth. They might be Pholiota. Knowing the spore color would really help here.
You’ll find that my photography has been quite good since mid-September, I think. I especially liked the way the “Cortinarius alboviolaceus series” turned out, with three successively more mature specimens shown in detail, with the gill color change and breakdown of the cortina apparent.
Field guides as we have known them are obsolete. Especially once cheap hand-held devices with high-res screens and cheap mobile internet become commonplace and the latter has good wilderness coverage. A web site (perhaps even this one) can do a better job, since it can have tens of thousands of images, or even hundreds of thousands with tens of thousands of species, and thousands of pages of text, plus access to live experts as already occurs here…
They certainly show the cortina or whatever it is well. And the gills suddenly become long with short gills near the margins. That should give a positive ID. Let me think about this for awhile.
Or at least some sort of very fibrous partial veil. View the image at full resolution (3 megapixels) and it becomes quite clear. :-) (Click thumbnail. Then click 640×480 version. Get 2048×1536 version.)
Covering most of the gills appears to be either a white mold (with sections of the gills still showing brown) or a very persistent cortina nearly covering most of the gills. Do you remember? Could be Naematoloma sublateritium as well.