What You Should Know
Trametes trogii is a species of fungus belonging to the family Polyporaceae. Fruit bodies are capped, lateral, stiff, with characteristic yellowish bristly pubescence above, with irregular angular pores below. Often found on aspen.
It has an almost cosmopolitan distribution. Widespread in North America but reports are more common in the northeastern states, from Minnesota to Maine, and Ontario. Found in Europe, where it is threatened in some northern countries; Russia, and China.
Other names: Trog's Tramete.
Trametes trogii Mushroom Identification
Polypore with sessile brackets but can be effused-reflexed or more rarely resupinate. Key characters are the large pores and the coarsely hispid cap surface: long, stiff, erect hairs, turning brown; context whitish. The bracket is hard, rigid, up to 6 to 12 cm wide, and projecting 2 to 4 cm. Upper surface hairs are pale to ochre-brown. Context below hairs whitish to cream, darkening with KOH. Context is lacking a black zone and has no sharp division between the context and the hairy covering.
Pale, thin-walled, and continuous with lower context; tube layer up to 1 cm thick.
Pale to honey-colored (darker on end view); pores angular to elongated, large, 1 or 2 per mm; pore surface can be uneven from lacerate (toothy) pore mouths. In age or when over-wintering the surface hairs can wear down but typically streaks (agglutinated hairs) are evident.
Trimitic with clamped generative hyphae, thick-walled skeletal hyphae, and branching binding hyphae.
Cyanophilous (dark blue with cotton blue stain) and metachromatic (bluish green-lilac with cresyl blue stain). Basidiospores cylindrical 7–9 × 2.5–4 µm.
White rot of dead hardwoods. Most often reported from quaking aspen but also found on other trees including willow, maple, birch, beech, elm, and oak.
Spring to fall, overwinters.
Trametes trogii Look-Alikes
Similar and also widespread but the context is rusty to umber brown and the spores are larger.
Has less coarse hairs, coloration generally more yellow, brackets larger up to 21 × 5 cm; context not a duplex.
Has a hirsute surface that has weak zones of gray, sometimes yellowish; pores are smaller and turn gray; pores round and surface even, not lacerate.
Thinner and more flexible.
Trametes trogii Taxonomy
This species has also been placed in Cerrena and with other synonyms in Daedalea, Inodermus, Microporus, and Polyporus. Authors have been unsure where to place it between the Trametes group with white context and the Coriolopsis–Trametella group with brown context. DNA revealed it was related to various "Coriolopsis s.l." rather than Trametes. Unfortunately, the type species for Coriolopsis is a Trametes. Among the orphaned "Coriolopsis s.l.", T. trogii is paired with C. gallica, the type species for Trametella. These two species may become part of Funalia but this determination awaits sequencing the type species for Funalia.
Trametes trogii Synonyms
Cerrena trogii (Berk.) Zmitr., 2001
Coriolopsis trogii (Berk.) Domański, 1974
Coriolus maritimus (Quél.) Quél., 1888
Daedalea trametes Speg., 1880
Funalia trogii (Berk.) Bondartsev & Singer, 1941
Inodermus maritimus Quél., 1887
Microporus ozonioides (Berk.) Kuntze, 1898
Polyporus maritimus (Quél.) Sacc., 1891
Polyporus ozonioides Berk., 1851
Polystictoides maritimus (Quél.) Lázaro Ibiza, 1916
Polystictus ozonioides (Berk.) Cooke, 1886
Striglia trametes (Speg.) Kuntze, 1891
Trametella trogii (Berk.) Domański, 1968
Trametes extenuata var. rhodostoma (Forq. ex Quél.) Pat., 1904
Trametes favus var. trogii (Berk.) Bres., 1909
Trametes gallica f. trogii (Berk.) Pilát, 1939
Trametes gallica var. trogii (Berk.) Sacc., 1925
Trametes hispida subsp. trogii (Berk.) Bourdot & Galzin, 1925
Trametes hispida var. rhodostoma Forq. ex Quél., 1888
Trametes lutescens f. trogii (Berk.) Bres., 1897
Trametes maritima (Quél.) Pat., 1900
Trametes ozonioides (Berk.) Mussat, 1901
Trametes tucumanensis Speg., 1898
Photo 1 - Author: Nina Filippova (Creative Commons Attribution 4.0 International)
Photo 2 - Author: Michel Langeveld (Creative Commons Attribution-Share Alike 4.0 International)
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Photo 4 - Author: Nina Filippova (Creative Commons Attribution 4.0 International)
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