Flammulina     Genus

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.

Fruiting body containing fibers (usually in the stalk)

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

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

Growing on trees or dead wood, leaves, or sticks, or organic debris, often in moss

Shaped like a “normal mushroom”
Small and fragile to medium-sized, except for one large, grey-capped species

Fruiting body small: cap up to 1 1/4" across (and most clearly smaller than that)

Diagnosis

• The genus is defined by a sticky cap, and prominent pleurocystidia.
  
• It tends to grow directly on wood, and is a little bit bigger (cap 3/4" - 1.5") than the other small white-spored things that fruit on wood

Comments

Narrow down your identification:

Cap warm brown in the center, yellow brown at the margin
Stem tough, light at the top, becoming reddish brown with a thick, very dark pubescence towards the base

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