Lyophyllum     Genus

Cortinarius husseyiKey to Gilled Mushrooms     Key
This is a key to gilled mushrooms, that is, mushrooms having a definite cap with a fertile surface consisting of gills. The fruiting body usually also has a stem, although that may be lateral or absent (usually, then, the mushroom is growing from wood). You can use this key to identify mushrooms that you find.

TricholomaAgaricales     Order
Fruiting body containing fibers (usually in the stalk)

Amanita onustaWhite Spored     Suborder
Spore print "light-colored": white or buff, sometimes tinged with pink or tan. Greenish and (except for the Russulales) yellow spore prints also go here
Stalk fibrous, not fracturing like a piece of chalk

TricholomataceaeTricholomataceae     Family
None of the special features distinguishing the other white-spored genera:
Gills not free, as in the Lepiotas and Amanitas
Basidia not extra-long, as in the Hygrophoraceae
Spores smooth, except for Lentinellus

TricholomaTerrestrial Trich     Subfamily
Growing on the ground

Laccaria laccataGrassland Trich     Tribe
Growing out in the open (lawn, field, etc.)

Lyophyllum     Genus     Karsten



Microscropic Characters


The distinguishing features of this taxon are chemical and microscopic. See comments under Lyophyllum decastes for distinguishing it from Tricholoma in the field

This genus is a toughy: if you put a single fruiting body of Lyophyllum decastes, by far the most common species in this genus, next to one of the grey (and poisonous!) Tricholomas, it would be almost impossible to tell them apart, even for an expert. So you have to go by their growth habit: L. decastes grows in dense clusters, while the Tricholomas at most grow in troops; and it is not mycorrhizal, so it can grow out in the open, away from trees

Narrow down your identification:

TricholomaLyophyllum decastes
Densely cestipose in open and disturbed areas
Cap 1-5" across; margin inrolled at first, uplifted in age; greyish brown to yellowish brown