Yellow Bolbitius     Section

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

Bolbitius vitellinusBolbitius     Genus
Cap slimy, deliquescing in maturity; striate, at least in maturity
Cap fragile, hollow

Yellow Bolbitius     Section     

Bolbitius titubans


Narrow down your identification:

Bolbitius titubansBolbitius titubans
Cap up to 1" across; bright yellow orange when young, fading around the margin in age; plicate in maturity
Stalk sometimes yellow

Bolbitius variicolor
Cap up to 2 3/8" across; some shade (brownish or greyish) of olive, sometimes with yellowish orange tints
Stalk usually pale yellow; scurfy

Bolbitius vitellinusBolbitius vitellinus
Cap up to 2 3/4" across; some shade of yellow at first, fading to grey or brown in age, striate in age
Stalk sometimes yellow, often becoming deeper in color in age; often scurfy