Choice edibleintermediate

Lobster Mushroom

Hypomyces lactifluorum / Lobster fungus

A firm host mushroom transformed by a red-orange parasitic fungus that erases most of the original gills.

Photo: Matt D'Agrosa, CC BY

Compiled by Mushroom Forage Map field deskExpert review pendingLast reviewed Aug 15, 2026

Identification warning

Reject soft, purple-tinged, foul, or badly decayed specimens because the original host can no longer be identified.

Season: Mid-summer through fall
Habitat: Conifer and mixed forest floor, often partly buried
Underside: Gills reduced to blunt ridges or fully covered
Spore evidence: Usually not practical once parasitized

Observation season

When field records occur

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Lookalikes to rule out

Old lobster mushroom

caution

Soft texture, purple discoloration, or a fishy odor indicate deterioration rather than a fresh specimen.

Unparasitized Russula or Lactarius

caution

Without the hard, finely pimpled red-orange crust, the host must be identified on its own merits.

Identification

This is a parasitic mold wrapped around another mushroom, usually Russula brevipes or Lactifluus piperatus. The result has a hard red-orange rind with a finely pimpled texture, dense white interior, and gills reduced to shallow ridges or covered entirely. It often pushes through forest duff half buried.

Uses and ecology

Fresh lobster mushrooms are firm and hold their texture in stews and sauteed dishes. The pigment can also be used in fabric dyeing. Evidence indicates that the parasite strongly favors non-dangerous hosts, but because the host is obscured, careful condition checks matter.

Memorable fact

The parasite turns notoriously bland hosts into a commercially sold delicacy.

Sources

iNaturalist taxon reference

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