Collection location: Marble Mountain Ranch, Siskiyou Co., California, USA [Click for map]
Sphagham substrate, canopy D.fir-madrone-tanoak. cap ap 3 cm.
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The problem with this specimen is the gills (more specifically, the lack thereof). Yet there are some vestigial gill ridges in the photo. You don’t mention whether the fungus was found on sphagnum-covered wood or not, so I suspect the fungal gills may have been parasitized by another fungus, in this case likely to be Hypomyces hyalinus, which typically grows on Lactarius or Russula species. Your specimen does resemble a Lactarius with the central cap depression. If I had to guess, Hypomyces hyalinus growing on some kind of Lactarius.