deadly galerina Identification (Galerina marginata)

Check the mushroom’s cap, gills, stem, and clustered growth.

• Cap is small, usually 1-4 inches (3-10 cm) wide, convex to flat, often with a slight central bump.
• Cap surface is smooth and moist-looking, honey-brown to yellow-brown, often darker toward the center.
• Gills are close together and attached to the stem, becoming rusty brown as spores mature.
• Stem is slender and pale to brownish, often with a faint ring zone near the upper part.
• Galerina marginata often appears in tight groups, with several stems rising close together.

Check all features together before relying on a visual ID.

Deadly galerina shows clear visual shifts as caps expand and veil remnants disappear.

• Young plant: Very young mushrooms are buttonlike, with a convex cap and the partial veil still covering the gills or hanging at the cap edge.
• Mature plant: As it expands, the cap becomes broadly convex to nearly flat, often 1-4 inches (2.5-10 cm) across, with a thinner, more even outline.
• Fruiting stage: Fully developed fruiting bodies show exposed rusty-brown gills and a stem ring zone; the cap surface often dries paler than in younger specimens.

Deadly galerina is most often noticed from fall into mild winter, when fresh honey-brown caps and a ring on the stem are visible on decaying wood. In drier or colder periods, fruiting bodies may be absent or reduced to older, darker, collapsed mushrooms, so the species can be much less obvious.

Several small brown wood-growing mushrooms can be mistaken for Galerina marginata.

Galerina marginata occurs across temperate regions of North America, Europe, and Asia. It is widely reported from conifer and mixed forests, and also from landscaped wood-chip beds. Habitat is a strong clue for identification because this species grows on decaying wood, buried roots, stumps, and woody debris, often in small groups. Finding it on wood helps separate it from many brown mushrooms that fruit from soil or grass.

• Highly poisonous mushroom: The fruiting body is toxic if eaten by humans or pets. It contains amatoxins, which can cause severe liver poisoning.
• Dangerous confusion with edible wood-growers: Misidentification is a serious ingestion risk. Galerina marginata can resemble honey mushrooms, but it usually has a rusty-brown spore print rather than a white one.