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Inocybe vinaceobrunnea

by Michael Kuo, 12 February 2024

Inocybe vinaceobrunnea is a denizen of hardwood and mixed hardwood-conifer forests east of the Rocky Mountains, tentatively recognized by its purple-brown colors, radially fibrillose cap surface, pinkish staining stem, and spermatic-sweet odor. Microscopic features should be verified for more confident identification, including smooth and ellipsoid spores, cheilocystidia but not pleurocystidia, and a pileipellis that is pinkish to reddish in KOH.

Traditionally North American authors have used the names Inocybe jurana and Inocybe adaequata for the mushroom featured here, but Matheny & Kudzma (2019) found phylogenetic differences among collections worldwide, concluding that "[a]t least four species can now be recognized in the Adaequata clade: European I. adaequata, Eurasian I. rhodolia, eastern North American I. vinaceobrunnea . . . and what likely represents an undescribed western North American species" (223).

"Inosperma vinaceobrunneum" is another combination for this mushroom, but the name was published in an online setting without editing, peer review, or even a shred of offered support (also the publication contains typos and incorrectly cites the original authors of the species); see this page for more discussion.

Thanks to Ron Kerner for collecting, documenting, and preserving Inocybe vinaceobrunnea; his collection is deposited in The Herbarium of Michael Kuo.


Ecology: Mycorrhizal; growing alone, scattered, or gregariously in association with hardwoods; originally described from Tennessee (Matheny & Kudzma 2019); widely distributed in the United States east of the Rocky Mountains. The illustrated and described collections are from Illinois, Indiana, and Kentucky.

Cap: 2–6 cm; conic at first, becoming broadly conic to broadly bell-shaped or plano-depressed, but retaining a central bump; dry; radially fibrillose; purplish brown, with a darker brown center; the margin at first somewhat inrolled.

Gills: Narrowly attached to the stem; close; short-gills frequent; whitish at first, becoming pale brown, then medium snuff brown; edges whitish.

Stem: 4–6 cm long; 0.5–1.5 cm thick; more or less equal above a slightly swollen base; dry; fibrillose with reddish fibrils; ground color whitish above and pinkish below; bruising and discoloring purplish pink.

Flesh: Whitish; pinkish to pink in the stem when sliced.

Odor: When fresh, sweet with a spermatic component; when dried specimens are rehydrated, strongly spermatic.

Chemical Reactions: KOH red to dark purplish red on cap surface.

Spore Print: Dull brown.

Microscopic Features: Spores 10–14 x 5–6.5 µm; ellipsoid, sometimes with one side somewhat flattened; smooth; walls about 0.5 µm thick; yellowish and often uniguttulate in KOH. Basidia 28–32 x 8–10 µm; clavate; 4-sterigmate. Pleurocystidia not found. Cheilocystidia 30–60 x 6–10 µm; cylindric-flexuous with subclavate, clavate, or merely rounded apices—or occasionally larger and saccate—smooth; thin-walled; hyaline to brown in KOH. Pileipellis a cutis; elements 4–10 µm wide, smooth or finely roughened, dull red in KOH; clamp connections present.

REFERENCES: Matheny, Ovrebo & Kudzma, 2019. (Kauffman, 1918; Kauffman, 1924; Arora, 1986; Phillips, 1991/2005; Kuo & Methven, 2014; Matheny, 2018; Matheny & Kudzma, 2019; Matheny et al., 2020.) Herb. Kuo 10010404, 08071301, 08271401, 08122201.

This site contains no information about the edibility or toxicity of mushrooms.


Inocybe vinaceobrunnea

Inocybe vinaceobrunnea

Inocybe vinaceobrunnea

Inocybe vinaceobrunnea

Inocybe vinaceobrunnea

Inocybe vinaceobrunnea

Inocybe vinaceobrunnea
Spore print

Inocybe vinaceobrunnea

Inocybe vinaceobrunnea

Inocybe vinaceobrunnea

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Cite this page as:

Kuo, M. (2024, February). Inocybe vinaceobrunnea. Retrieved from the MushroomExpert.Com Web site: