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Panellus

Field characters

Pileus: generally small, and very tough (in the common species), greenish in our populations, usually with an inrolled margin
Annulus: none
Stipe: eccentric, lateral or sometimes absent
Stature: Pleurotoid
Ecology: saprophyte or parasite on wood

Micro characters

Basidiospores: long cylindric, usually quite "thin", amyloid (although my photos don't demonstrate this)
Hyphae: inamyloid with clamp connections.
Cystidia: no pleurocystidia (present according to www.mycokey.com), cheilocystidia usually present.
Spore Print: white to cream
Lamellae: close to crowded, yellowish
Lamellar Trama: regular to irregular
Pileipellis: branched filaments.

Notes

P. serotinus is called the "late fall oyster". I'll agree with the "late fall" part -- it is one of the last mushrooms one can collect in a year. It is so tough I wouldn't think of eating it, but it is considered edible.

P. stipticus is interesting because it is bioluminescent.