Key to Gilled Mushrooms KeyThis 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.
Agaricales OrderFruiting body containing fibers (usually in the stalk)
Amanita GenusFruiting body having a combination of some of the following characteristics:
Stalk growing out of a cup of cottony tissue called a volva (all white-spored mushrooms with a volva go here)
Cap with scattered patches or flakes of the same sort of tissue as the volva (see second picture), easily peeled off
Annulus (skirt-like ring on stalk)
Phalloideae SectionAnnulus always present
Either volva present, sack-like and cap either white or olive brown, or
Stalk with a basal bulb and cap either greyish brown or yellow
Saccate Phalloideae SubSection
Diagnosis
Narrow down your identification:
Amanita bisporigeraEntire fruiting body white, small to medium
Cap staining yellow with KOH
Amanita phalloidesCap up to 6" across; virgate, making it look a little streaked; yellowish green at margin, shading to olive brown over the disk
Volva usually lobed or petalloid, almost resembling a tulip in shape
Amanita virosaEntire fruiting body white, medium to large