Agrocybe praecox

     Agrocybe semiorbicularis

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)

Inocybe pyriodoraBrown, Olive, Orange or Tan Spored     Suborder
Gills not free
Spore print tan, orange, deep ochre, yellowish olive, olive brown, rusty or cinnamon brown or deep brown
Ring usually either absent or not membranous

Pholiota albocrenulataLignicolous Brown Spored     Family
Growing on wood

Gymnopilus spectabilisMedium To Big Lignicolous Brown Spored     Subfamily
Cap usually more than 2" across, and sometimes up to 8; usually tan, yellow, or pumpkin-colored

AgrocybeAgrocybe     Genus
Cap dull brown to tan; glabrous (occasionally slimy or viscid); often cracking open like an overripe tomato in age; usually 2-3" across
Fruits in great quantity in wood chips in the springtime
Growing either on hardwood or in grass

Agrocybe praecox     (Persoon: Fries) Fayod

Here are the characters that distinguish this species from the others in its group. For its more general characters, see higher up on the page.
If there's just a few words or a microscopic feature here, a more thorough description can be found above.


Microscropic Characters


If it were not for the tremendously important weight of tradition, and the fact that every one of my books distinguishes them, I would long ago have synonymized this species with Agrocybe acericola (okay, I sort of did, but that's only so you can read about them both together here). Their spores are the same size; they're Agrocybes, so everything else is similar, too. The only consistent differences I can detect between the two species concepts are:

The distinctions in the field guides:

You now know as much as I do
Good luck