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Porpoloma

Field characters

Pileus: dry, convex to planar (dark grey in our species)
Annulus: absent
Stipe: central
Stature: Tricholomatoid
Ecology: on humus (although some species are reported to be ectomycorrhizal)

Micro characters

Basidiospores: smooth, amyloid
Hyphae: with clamp connections
Cystidia: cheilocystidia usually present, "making the edge of the lamellae distinctly heteromorphous" (Singer 1986)
Spore Print: white
Lamellae: adnate to sinuate
Lamellar Trama: regular
Pileipellis: fibrillose , smooth or tomentose, but always dry

Notes

Bessette et al. (1997) call Porpoloma umbrosum the "Amyloid Tricholoma". Singer created this genus in 1952 and justifies the separation from Trichloma because of Porpoloma's amyloid spores, hyphae with clamp connections, and heteromorphous lamellar gill edge. Tricholoma has none of these characters, so it appears to be a valid genus.

This mushroom is collected infrequently.