Coprinellus Probably Coprinellus disseminatus

Found 04/30/13 on a hike above Triple Falls in the Gorge
Growing on a Stump -
Very black spore Print
Gills are not free
Stem was hallow and fibrous
Some evidence of a veil on the edge of the cap
Cap does slowly deliquesce
Cap size 3 cm.

Sava says: I don't believe Psathyrella can have so deeply grooved (plicate) caps. It's a "Coprinus", even if the gills are not deliquescing. Coprinellus disseminatus perhaps, though it looks a little too big for it.

My comments:
MushroomExpert.com says that the gills of Coprinellus disseminatus are
"attached to the stem or free from it"

MushroomExpert.com also says that the stem of Psathyrella is "snap-able" Likewise the Key Council site says that the Psathyrella stem "is slender and fragile, often snapping evenly and cleanly in half" My specimen clearly does not have a snappable stem.