Megacollybia platyphylla

Older Names
     Tricholomopsis platyphylla

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

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

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

Megacollybia     Genus
Megacollybia platyphylla
Cap distinctly greyish, often with sparse black fibrils
Gills quite deep, almost distant
White rhizomorphs attached to base of stalk
Growth habit solitary to several
No annulus
Links from Look-alikes
LentinoLignoTrich     Subtribe
Lentinellus ursinus
All mushrooms with serrated gills go here
If the stem is central and well-developed, then the fruiting body (even the cap) is large and extremely tough

Megacollybia platyphylla     (Persoon: Fries) Pouzar & Kotlaba

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.

Megacollybia platyphylla



The cap can get so big that it falls apart under its own weight when you try to pick it
This is not a recommended edible. It is often bitter (or just foul-tasting), and even when not so it is not delicious. Some people have also gotten sick from it

Megacollybia platyphyllaThis is the only species in this genus in the northern temperate zone. It is quite common on the east coast, west to Iowa, according to Lincoff (1987) , uncommon west of Ohio, according to A. E. Bessette, D. W. Fischer & A. R. Bessette (1997) . This (2001) has been a banner year for it in the midwest
When it gets older, the gill edges get very irregular, and I have mistaken it for a Lentinus in this condition