Armillaria     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

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

Grey Brown LignoTrich     Subtribe
Armillaria tabescens
Fruiting body medium-sized to large
Cap grey to brown, sometimes with radiating with dark brown to black fibrils
All else white or concolorous with cap
Growing on wood or duff
Links from Look-alikes
Tricholoma-like Fungi     Subtribe
Tricholoma flavovirens
Woodland habitat (mycorrhizal)
Stem fleshy, not rooting

Armillaria     Genus     (Battara: Fries) Staude

Armillaria gallica



For more pictures of this genus, and a different key, see Tom Volk's Armillaria key

Narrow down your identification:

Armillaria gallicaArmillaria gallica
Usually growing on ground, not wood, in troops
Annulus fibrillose, cottony
Fruiting bodies only an inch or two across, often connected directly to rhizomorphs

Armillaria melleaArmillaria mellea
Cap yellow or yellowish brown a little darker at the center; without scales, though it may have some dark hairs in the center
Growing cestipose, usually on hardwoods
Cap often viscid, but sometimes dry
Annulus membranous, white

Armillaria gallicaArmillaria ostoyae
Grows cestipose on or at the base of conifers
Cap brown, often more than 4" across, covered with dark brown scales
Brown or brown-rimmed annulus

Armillaria tabescensArmillaria tabescens
No annulus
Cap yellow; scales reddish-brown to brown, thickest at the disk