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Pluteus

Field characters

Pileus: convex to planar, never viscid, may have minute hairs or scales.
Annulus: usually absent
Stipe: easily separates from the pileus
Stature: Pluteoid
Ecology: saprophytic on detritus and very rotten wood (on ground)

Micro characters

Basidiospores: usually small, smooth, ovoid to cylindrical
Hyphae: inamyloid, with or without clamp connections
Cystidia: cheilocystidia and pleurocystidia usually present, in a few species only cheilocystidia present (Singer, 1986)
Spore Print: pink
Lamellae: free, quite soft, crowded
Lamellar Trama: convergent (inverse)
Pileipellis: various

Notes

This is one of the cases where the original Friesian concept of the genus has remained mostly intact.

If your mushroom has free gills, and pink spores with no annulus, it is probably a Pluteus. Even in the field it is common to identify the gill surfaces as pinkish. If you really want to double check, the convergent gill trama is very unusual and further distinguishes this genus. My attempts to photograph this failed, but Iíll keep trying.