Public Description of Daedaleopsis confragosa (Bolton) J. Schröt.

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Name: Daedaleopsis confragosa (Bolton) J. Schröt.
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 Draft For 2008/2009 Eol University Species Pages Initiative By Melinda Mundt (Private)
 Draft For Wild Mushrooms Of The Northeastern United States By Erlon Bailey (Private)
 Draft For Polypore Project By Chaelthomas (Private)

Description status: Unreviewed

Taxonomic Classification:

Domain: Eukarya
Kingdom: Fungi
Phylum: Basidiomycota
Class: Agaricomycetes
Order: Polyporales
Family: Polyporaceae

General Description:

Daedaleopsis confragosa is commonly known as the Thin-maze Flat Polypore or the Blushing Bracket. This fungus is characterized by a white spore-bearing surface with elongated, maze-like pores.
The pileus is wide and kidney-shaped, with a fibrous texture ranging from 3-15.5 cm (1 1/8-6 in). Concentric zones are visible on the top of the pileus. Usual colors of the top of the pileus range from creamy white to grayish to pale brown. Handling of the pileus can cause reddish-brown bruising when the specimen is fresh. With KOH, all parts of the pileus turn black. There is no stipe on this polypore.
The spore print is white. The spores are hyaline with sizes of 7-11 um, 2-3 um, with a cylindrical to sausage shape, and smooth edges.
D. confragosa can be found solitary, scattered, or in groups. This organism is found on decaying hardwoods, causing a white rot. The fungus is persistent year-round. This species is considered to be common.
D. confragosa is inedible because of its tough, fibrous texture.

This organism has previously been referred to as Daedalia confragosa.

Diagnostic Description:

The pores of D. confragosa are smaller than 1 mm with concentric zones on the top of the pileus. The similar polypore, Daedalia quercina, has pores that are larger than 1 mm without concentric zones on the top of the pileus. Trametes elegans is another polypore that looks similar to D. confragosa but has no concentric zones on the top of the pileus..

The spores of D. confragosa are larger than the spores of both D. quercina and T. elegans.

Similar looking polypores do not bruise red or brown when handled or scratched, as D. confragosa does when fresh.

D. quercina is larger and thicker than D. confragosa, with pores 1-2 mm wide. D. quercina causes a brown rot.

T. elegans is completely white, with pores that are different shapes in the base and margin of the pileus.


D. confragosa grows commonly in eastern hardwood forests of North America. It can also be found in the Northwest and Southwest. It has not been found in western North America. The states that it has been found include: Washington, Montana, North Dakota, South Dakota, Arizona, New Mexico, Texas, Louisiana, Arkansas, Missouri, Iowa, Minnesota, Wisconsin, Michigan, Indiana, Tennessee, Kentucky, Mississippi, Alabama, Georgia, Florida, South Carolina, North Carolina, West Virginia, Virginia, Ohio, Pennsylvania, New York, Maryland, Delaware, New Jersey, Connecticut, Rhode Island, Massachusetts, Vermont, Maine, and New Hampshire. It has been found in Canada in: British Columbia, Alberta, Manitoba, Ontario, Nova Scotia, and New Brunswick. This polypore can also be found throughout Europe.


D. confragosa is saprophytic, causing a white rot. It prefers hardwoods, especially willow (Salix), aspen (Populus), and birch (Betula). It is very unlikely to find D. confragosa growing on conifers. This polypore is found commonly, year-round.

Look Alikes:

Daedalia quercina looks similar but is larger and thicker. As the name implies, D. quercina grows primarily on oak trees (Quercus), while D. confragosa tends not to grow on oak trees. Also, the spores of D. quercina are smaller than that of D. confragosa. Pore sizes are different between the two.

Trametes elegans looks similar but is white. The spores of T. elegans are smaller than D. confragosa. The pore surfaces of D. confragosa and T. elegans appear different. T. elegans has a pore surface that changes from regular to maze-like throughout.


This fungus has some medicinal purposes. Chemicals have been isolated from this polypore that have antifungal and antibacterial properties.


Bessette, A.E., A.R. Bessette, & D.W. Fischer. Mushrooms of Northeastern North America. 1997. Syracuse, NY: Syracuse University Press, 2002.

Gilbertson, R.L. & L. Ryvarden. North American Polypores. Vol. 1. Oslo, Norway: Fungiflora, 1986.

Kuo, M. “Daedaleopsis confragosa.” Mar. 2005. Accessed Nov. 2008.

Sasata, R. “Daedaleopsis confragosa.” Medicinal Mushrooms. Oct. 21 2008. Accessed Nov. 8 2008.


This organism has previously been referred to as Daedalea confragosa.

Melinda Mundt
UW-La Crosse Mycology
November 2008

Current Name:
Daedaleopsis confragosa (Bolton) J. Schröt., in Cohn, Krypt.-Fl. Schlesien (Breslau) 3.1(25–32): 492 (1888) 1889

Agaricus confragosus (Bolton) Murrill, Bull. Torrey bot. Club 32(2): 86 (1905)
Amauroderma confragosum (Van der Byl) D.A. Reid, Jl S. Afr. Bot. 39(2): 156 (1973)
Boletus confragosus Bolton, Hist. fung. Halifax, App. (Huddersfield): 160 (1792) 1791
Daedalea confragosa (Bolton) Pers., Syn. meth. fung. (Göttingen) 2: 501 (1801)
Daedalea confragosa f. rubescens (Alb. & Schwein.) Domański, Orloś & Skirg., Flora Polska. Grzyby, II: 249 (1967)
Daedalea intermedia Berk., J. Linn. Soc., Bot. 18: 385 (1881)
Daedalea rubescens Alb. & Schwein., Consp. fung. (Leipzig): 238 (1805)
Daedaleopsis confragosa f. sibirica (P. Karst.) Bondartsev, Trut. Grib Evrop. Chasti SSSR Kavkaza [Bracket Fungi Europ. U.S.S.R. Caucasus] (Moscow-Leningrad): 571 (1953)
Daedaleopsis confragosa var. rubescens (Alb. & Schwein.) Ljub., in Lyubarskiĭ & Vasil’eva, Derevorazrushayushchie Griby Dal’nega Vostoka [Wood destroying fungi of the [Soviet] far East] (Novosibirsk): 140 (1975)
Daedaleopsis rubescens (Alb. & Schwein.) Imazeki, Acta phytotax. geobot., Kyoto 13: 251 (1943)
Ischnoderma confragosum (Bolton) Zmitr. [as ‘confragosa’], Mycena 1(1): 92 (2001)
Lenzites confragosa (Bolton) Pat., Essai Tax. Hyménomyc. (Lons-le-Saunier): 89 (1900)
Lenzites sibirica P. Karst., Finl. Basidsvamp. 46(no. 11): 3 (1904)
Lenzites tricolor var. rubescens (Alb. & Schwein.) Teng, Fungi of China (Ithaca): 394 (1996)
Polyporus confragosus (Bolton) P. Kumm., Führ. Pilzk. (Zwickau): 59 (1871)
Polyporus confragosus Van der Byl, S. Afr. J. Sci. 24: 225 (1927)
Polyporus rubescens (Alb. & Schwein.) P. Kumm., Führ. Pilzk. (Zwickau): 59 (1871)
Striglia confragosa (Bolton) Kuntze, Revis. gen. pl. (Leipzig) 2: 871 (1891)
Striglia intermedia (Berk.) Kuntze, Revis. gen. pl. (Leipzig) 2: 871 (1891)
Trametes confragosa (Bolton) Jørst., Atlas Champ. l’Europe (Praha) 3: 286 (1939)
Trametes confragosa (Bolton) Jørst., Atlas Champ. l’Europe (Praha) 3: 286 (1939) f. confragosa
Trametes confragosa f. rubescens (Alb. & Schwein.) Pilát, in Kavina & Pilát, Atlas Champ. l’Europe (Praha) 3: 228 (1938)
Trametes rubescens (Alb. & Schwein.) Fr., Epicr. syst. mycol. (Upsaliae): 492 (1838) [1836-1838]

Description authors: Tom Volk, Melinda Mundt (Request Authorship Credit)
Description editors: Nathan Wilson, Erlon Bailey, walt sturgeon