Public Description of Microstoma floccosum (Schwein.) Raitv.

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Name: Microstoma floccosum (Schwein.) Raitv.
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Description status: Unreviewed

Taxonomic Classification:

Domain: Eukarya
Kingdom: Fungi
Phylum: Ascomycota
Class: Leotiomycetes
Order: Pezizales
Family: Sarcoscyphaceae

General Description:

Fruiting Body: Goblet shaped to cup shaped, with a stem; to about 1 cm wide and 4 cm high; upper surface bald, bright red; outer surface red, covered with dense white hairs; margin fringed with white hairs that aggregate into pointed bundles; stem 1-3 cm high, 2-5 mm thick, whitish to grayish, densely hairy; flesh thin and reddish.

Microscopic Features: Spores 20-35 × 14-17 µ; smooth; narrowly ellipsoid; when fresh sheathed with a thick hyaline perispore. Asci 8-spored; hyaline in KOH; inamyloid; cylindric. Paraphyses branched and networked, forming meshes and reticulate patterns; sometimes enclosing or encasing asci (and then sometimes creating the impression of asci with apical projections); septate; individual arms generally 1-3 µ wide; hyaline to, en masse, reddish in KOH. Hairs on excipular surface dissolving in KOH mounts to a central fragmented core of thin-walled, septate cells 4-5 µ wide—but in Melzer’s reagent clearly visible as long, thick-walled elements up to 1,000 µ long and 20 µ wide.


North America where it is widely distributed east of the Rocky Mountains.


Saprobic on decaying hardwood sticks and logs (sometimes buried); growing scattered, gregariously, or (more often) in clusters of 3-6; early summer and summer


Kuo, M. (2012, June). Microstoma floccosum. Retrieved from the MushroomExpert.Com Web site:


Current Name:
Microstoma floccosum (Schwein.) Raitv., Eesti NSV Tead. Akad. Toim., Biol. seer 14: 529 (1965)

Anthopeziza floccosa (Schwein.) Kanouse, Mycologia 40(4): 491 (1948)
Geopyxis floccosa (Schwein.) Morgan, J. Mycol. 8(4): 188 (1902)
Microstoma floccosum (Schwein.) Raitv., Eesti NSV Tead. Akad. Toim., Biol. seer 14: 529 (1965) var. floccosum
Peziza floccosa Schwein., Trans. Am. phil. Soc., Ser. 2 4(2): 172 (1832)
Plectania floccosa (Schwein.) Seaver, North American Cup-fungi, (Operculates) (New York): 192 (1928)
Sarcoscypha floccosa (Schwein.) Sacc., Syll. fung. (Abellini) 8: 156 (1889)

Anthopeziza floccosa, Sarcoscypha floccosa, and Plectania floccosa are synonyms. “Microstoma floccosa” represents an error in Latin agreement perpetuated in several field guides.

Description author: walt sturgeon (Request Authorship Credit)

Created: 2014-01-07 22:42:15 CST (-0500) by walt sturgeon (Mycowalt)
Last modified: 2014-01-07 22:42:15 CST (-0500) by walt sturgeon (Mycowalt)
Viewed: 19 times, last viewed: 2018-07-10 22:44:03 CDT (-0400)