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Remarks (public):For a complete description including images see www.cababstractsplus.org/dfb 
Remarks (internal):Most readily separated from Fomitopsis cajanderi (Karat.) Kotl. & Pouz. (= Fomes subroseus (Weir) Overholts) by the temperature response of the mycelium, the latter species producing more vigorous growth at 30-32°C (8: 147). No clamp connections form when monosporous mycelia are paired with F. cajanderi (16: 646). Cartwright & Findlay (1958) have reported this species to be rather rare in Europe and America where it has frequently been confused with the more common Fomitapsis cajanderi.
 
Description type:Non-original description 
Description:Fomitopsis rosea (Alb. & Schwein.: Fr.) P. Karst., Meddn Soc. Fauna Flora fenn. 6: 9, 1881.
= Polyporus roseus Alb. & Schwein.: Fr., Syst. Mycol. 1: 372, 1821.
= Fomes roseus (Alb. & Schwein.: Fr.) P. Karst., 1879.
Carpophore perennial, sessile, with broad basal attachment. Pileus 1-7 x 1,5-15 x 1-3 cm, appressed-reflexed to ungulate; upper surface pinkish or purplish-brown, often remaining so at the margin, becoming smoky brown to blackish with age, glabrous, azonate, developing a rimose crust; margin obtuse. Context 2-10 mm thick, pink to pale rose, indistinctly zonate, soft corky to hard. Pore surface pale pinkish to avellaneous; pores regular, subcircular, 3-6 per mm, 100-250 µm diam., dissepiments 25-70 µm thick, edge entire; tubes stratified, 0,5-3 mm long in each layer, old tubes white stuffed. Basidiospores 4,5-7 x 2-2,8 (av. 5,8 x 2,3) µm, ellipsoid cylindric to oblong cylindric, hyaline, smooth, thin-walled, with few contents. Basidia 11-15 x 5-6 µm, clavate, 4-spored. Cystidia absent. Hyphal system non-agglutinated, essentially dimitic but with a few binding-hyphae present towards the base of the context. Generative Hyphae 1-2,5 µm diam., hyaline, thin-walled, freely branching, septate with prominent clamp-connexions. Skeletal Hyphae 1,5-5 µm diam., hyaline or with a pinkish tint, unbranched, of unlimited growth, thick-walled (to 2 µm thick) with narrow lumen, non-septate. Binding Hyphae sparse, 1-3 µm diam., hyaline or nearly so, with short nodulose branches of limited growth, thick-walled with capillary lumen. Colonies growing slowly on malt agar, 3,5-4,5 cm in 7 days, optimum temperature 31°C (17: 423), mat pink or vinaceous, downy or farinaceous becoming felty, forming granular or irregularly poroid surfaces after 3-4 weeks, test for extracellular oxidase negative to weakly positive with garlic or tannic acid agars, negative with guaiacum (45, 646); isolates reported heterothallic and bipolar (16: 646).
Hosts: On Abies, Picea, Pseudotsupa, Tsuga and Thuja.
Disease: Brown top rot of conifers, forming a tan to reddish-brown, soft cubical rot on both living and dead wood. Infection usually originates in the upper part of the stem or crown.
Geographical distribution: Africa (Kenya); Asia (India, Japan, Pakistan, U.S.S.R.) Europe (Czechoslovakia, Finland, France, Germany, Great Britain, Hungary, Netherlands, Norway, Poland, Yugoslavia); North America (Canada, U.S.A.).
Physiological specialization: Not known. Indications of a relationship with Fomitopsis cajanderi have been obtained in serological comparisons (44, 1438).
Transmission: By air-borne spores.
Literature: Boyce, Tech. Bull. U.S. Dep. Agric. 286: 28, 1932; Eades, Dept. Int. Canada Forest Serv. Bull. 80: 79, 81, 1932 (brown top rot of conifers); Mounce & Macrae, Can. J. Res. 15: 154-161, 1937; Cartwright & Findlay, Decay of timber and its prevention, 1958 (cultural and morphological characters); Overholts, The Polyporaceae of the United States, Alaska, and Canada, p. 56, 1953; Pilat, Atlas des champignons de l'Europe 3: Polyporaceae, p. 352, 1942; Lowe, The Polyporaceae of North America. The genus Fomes, p. 71, 1957 (description).
 
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