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Coprinopsis romagnesiana

by Michael Kuo, 22 June 2024

Coprinopsis romagnesiana is, more or less, a scaly version of the well known inky cap Coprinopsis atramentaria. While the latter species has a gray cap with a few tiny scales over its center, Coprinopsis romagnesiana is more prominently decorated with brown to orangish brown scales. Like other coprinoid mushrooms, it features gills that turn black with age and eventually liquefy, creating an inky goo.

The scales of Coprinopsis romagnesiana adhere tightly to the surface of the cap, which helps to separate the species from coprinoid mushrooms with more woolly or cottony scales that can be scraped off easily (for example Coprinopsis strossmayeri). The adherent orangish brown scales, combined with the large size (for a coprinoid) and the tendency to grow in clusters on or near stumps and dying or dead tree roots, probably suffice for identification.

Coprinus romagnesianus and Coprinus atramentarius squamosus (a taxonomically invalid previous name) are synonyms.


Ecology: Saprobic, growing in clusters on stumps or from senescent roots around stumps; spring and summer; originally described from northern Italy (Bresadola 1931); distributed in Europe and North America, especially in northern and montane areas; also reported from Argentina. The illustrated and described collection is from Michigan.

Cap: 2–6 cm across; oval when young, expanding to bell-shaped or convex; whitish to grayish underneath orange-brown, adherent scales; the margin becoming grooved.

Gills: Narrowly attached to the stem or free from it; crowded; white at first, becoming gray, then black; eventually liquefying.

Stem: 4–7 cm long; up to about 1.5 cm thick; more or less equal; white and fairly bald above; lower portion with a sheathed appearance, adorned with orange-brown scales or fibrils; becoming hollow.

Flesh: White; not changing when sliced.

Odor: Not distinctive.

Spore Print: Black.

Microscopic Features: Spores 7–12 x 5–6 µm; ellipsoid, with a large pore about 2 µm across; smooth; brown in KOH. Basidia 4-sterigmate; surrounded by brachybasidioles. Pleurocystidia 100–175 x 20–30 µm; subcylindric to subutriform; smooth; thin-walled; hyaline in KOH. Cheilocystidia similar to pleurocystidia. Veil elements more or less cylindric; up to about 20 µm wide; branching; occasionally diverticulate. Clamp connections present.

REFERENCES: (R. Singer, 1951) S. A. Redhead, R. J. Vilgalys & J. -M. Moncalvo, 2001. (Moser, 1983; Uljé, 2003; Uljé, 2005; McNeil, 2006; Boccardo et al., 2008; Gierczyk et al., 2011; Buczacki et al., 2012; Nagy et al., 2013; Lechner 2015; Vesterholt, 2018; Læssøe & Petersen, 2019; Kibby, 2021.) Herb. Kuo 05230504.

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Coprinopsis romagnesiana

Coprinopsis romagnesiana

Coprinopsis romagnesiana

Coprinopsis romagnesiana
Bresadola's 1931 illustration of Coprinus atramentarius squamosus

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Kuo, M. (2024, June). Coprinopsis romagnesiana. Retrieved from the MushroomExpert.Com Web site: