Oyster Mushroom

Pleurotus pulmonarius

Mushroom ID is a rule-out game. Every entry below describes something that looks similar — learn the differences before eating.

Angel WingsPleurocybella porrigens

⚠️ Toxic

Angel wings (Pleurocybella porrigens) are THINNER, PURER WHITE, and grow only on CONIFER wood. Oysters are THICKER, GRAY-TO-CREAM, and grow on HARDWOODS. Angel wings have caused fatalities in Japan — avoid any pure-white shelf on conifers.

Jack-o-LanternOmphalotus olearius

⚠️ Toxic

Oysters have WHITE-TO-CREAM caps with gills running DOWN the short stem, growing as SHELVES on wood. Jack-o-lanterns are BRIGHT ORANGE and grow in ROUND CLUSTERS at tree bases, not shelf-like.

🌳 Host Trees & Plants

This species is found with or partners with the following hosts. Ectomycorrhizal hosts (green border) form a root-level partnership; ericoid / arbutoid shrubs (purple border) share the same mycorrhizal networks.

Dead Hardwood

Saprobic substrate

Saprobic substrate

Fallen logs, stumps, and dying hardwood — substrate for oyster, turkey-tail, dryad’s saddle, and most hardwood saprobes.

Hardwood Forest

Fagaceae / Betulaceae (generic)

Saprobic substrate

Generic hardwood habitat — oak, maple, beech, birch, etc. Shown when the species is reported from hardwoods generally.

Habitat

Dead and dying cottonwood, aspen, and other hardwoods along creek bottoms. Saprotrophic (decomposes wood). Unique in Colorado for having spring AND fall seasons.

Growing Requirements

Look-Alikes

Identification Tips

• ✓Should smell pleasant and mild — reject any with an off smell
• ✓Check dead cottonwoods along streams in spring and fall
• ✓One of the few mushrooms with two seasons in Colorado
• ✓Grows in clusters — one log can produce a meal's worth