Karstenia 18: 55. 1978.
Common Name: none
Synonym: Phaeomarasmius confragosus (Fr.) Singer; Pholiota confragosa (Fr.) P. Karst.
Cap 2-7 cm broad, convex, becoming broadly convex, expanding to nearly plane, margin striate when moist, sometimes uplifted in age; surface dry, smooth, hygrophanous, dull orange-brown fading to pale buff-brown; flesh thin, colored like the cap, unchanging; odor and taste mild.
Gills adnexed to notched, broad, close, buff-brown at first, dingy orange-brown in age, lighter than the cap.
Stipe 3-5 cm tall, 2-7 mm thick, fragile, hollow, cartilaginous, sometimes flattened; equal to tapering to a slightly narrowed base, the latter with pallid, cottony mycelium; surface moist, appressed silky-fibrillose over a buff-brown background; flesh colored like the cap, unchanging; veil thin, membranous forming an evanescent superior veil.
Spores 6-7.5 x 3.5-4.5 µm, elliptical, smooth; spore print dull orange-brown.
Gregarious, clustered, or in troops on wood chips or other lignicolous debris; fruiting throughout the mushroom season.
Like its close cousin Tubaria furfuracea, T. confragosa often fruits in large numbers on wood chips. It differs in being larger and lacking an appendiculate cap margin, the veil instead forming an evanescent ring. Otherwise, these two species intergrade in spore size and in spore print color. T. confragosa is not as common as T. furfuracea.
Knudsen, H. & Vesterholt, J. ed. (2008). Funga Nordica: Agaricoid, boletoid and cyphelloid genera. 965 p.
Matheny, P. .B., Vellinga, E.C., Bougher, N.L., Ceska, O., Moreau, P.-A. , Neves, M.A. & Ammirati, J.F. (2007). Taxonomy of displaced species of Tubaria. Mycologia 99(4): 569-585.
Smith, A.H. & Hesler, L.R. (1968). The North American Species of Pholiota. Hafner Publishing Company: New York, NY. 492 p.