Mystery mushroom D, cap and spore print, suspected Psathyrella candolleana complex (pic 2 of 2)

Cap 2", margins striated, center has tan center, chocolate brown spores, white stalk that snaps, fibrous and hollow, clusters of these surrounding the base of a norway maple on all sides. I photographed the young ones (Mystery Mushroom D from a few days ago) and they had yellow-brown caps with cobwebby veil still covering gills, some of it stretching across the young caps. This specimen was the most intact well developed one (see previous pictures). Gills brownish but I guess they're whitish when young. Sounds much like the Psathyrella candolleana complex. http://www.mushroomexpert.com/psathyrella_candolleana.html