Common Fieldcap

Agrocybe pediades

''Agrocybe pediades'' is a typically lawn and other types of grassland mushroom, but can also grow on mulch containing horse manure.
Agrocybe pediales many characteristics of Psilocybes - but some not so much. Mottled decurrent gills, dark spores, tiny bits of veil remnants, smooth cap with a surface that feels a little greasy and rubs right off if touched.

OK folks... for all of you silly people who have walked up and asked me "is that a magic mushroom" and been huffy when I've said no - I don't know exactly what it is, and I suggest you never eat anything you that you don't know exactly what it is... (what... do you think I'm lying so I can keep them all for myself ?!?) I might have finally, after many years of photographing mushrooms, seen one.. and I _still_ don't know exactly what it is... working on it..  Agrocybe pediades,Agrocybe pediales,Fall,Geotagged,United States

Naming

It was first described as ''Agaricus pediades'' by Swedish mycologist Elias Magnus Fries in 1821, and moved to its current genus ''Agrocybe'' by Victor Fayod in 1889. A synonym for this mushroom is ''Agrocybe semiorbicularis''.

Some experts divide Agrocybe pediades into several species, mainly by habitat and microscopic features, such as spore size. It is recognized by the large, slightly compressed basidiospores with large central germ-spore, 4-spored basidia, subcapitate cheilocystidia and reare development of pleuro cystidia.

References:

Some text fragments are auto parsed from Wikipedia.

Taxonomy
KingdomFungi
DivisionBasidiomycota
ClassAgaricomycetes
OrderAgaricales
FamilyStrophariaceae
GenusAgrocybe
SpeciesA. pediades