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Page number:61 
Remarks (internal):Up to recently this species was forgotten and treated as a form of Polyporus melanopus, but Niemelä & Kotiranta (1991) brought it back into consideration. Undoubtedly it represents a separate species. It is recognized by growing on dead wood, often on thin sticks and by having a reddish brown to bay funnel-shaped, thin and usually small pileus, (more or less flat to undulating, wide and greyish brown to pale umber brown in P. melanopus), small pores (3-4 per mm in P. melanopus), and a slender, finely wrinkled stipe (thicker, shorter and more irregular in R melanopus). Polyporus badius has the same type of colouring on the pileus, but is a distinctly southern, more robust species with simple-septate generative hyphae. P. varius has a pale ochre to pale leather coloured pileus, a black, smooth, short to almost absent stipe and longer spores (9-12 µm). Its pileus becomes white in overwintered specimens, not dark bay to almost black as in P. tubaeformis. 
Description type:Non-original description 
Description:Polyporus tubaeformis (P. Karsten) Gilb. & Ryvarden Fig. 18 European polypores 2:578, 1994. Polyporellus varius subsp. tubaeformis P. Karsten, Soc. Flora Fauna Fenn. Medd. 9:69, 1882.
Basidiocarps annual, usually more or less centrally stipitate; pileus up to 6 cm wide, usually deeply funnel-shaped, at first greyish white and finely velutinate, soon becoming reddish-brown to orange brown with fine, radial lines and with only scattered remains of the tomentum, with age becoming deep bay and glabrous, smooth in fresh condition, with age finely radially wrinkled, dense and hard in dry condition and then with a very thin, but distinct cuticle (lens!), margin thin and bent down in dry condition; pore surface at first whitish, soon becoming pale straw-coloured to ochraceous, pores round to slightly angular, dissepiments entire, 5-7 per mm, tube layer concolorous, 1-2 mm thick, dense and slightly cartilaginous in dry condition; context 1-2 mm thick, white and dense; stipe slender, rarely above 5 mm wide, 1-6 cm long, dark sepia brown and finely velvety becoming glabrous and black with age, upper part often with some shallow pores, finely wrinkled when dry (lens), dense and in section with a white homogeneous core and a fine black cuticle below the tomentum.
Hyphal system dimitic; generative hyphae with clamps, hyaline, thin-walled, branched, often difficult to find in dry specimens, 2-4 µm in diam, forming a palisade on the stipe and the pileus surfaces skeleto-binding hyphae subsolid with a narrow lumen, 23 µm wide, tightly interwoven, up to 6 µm wide, tapering to 1-2 µm at the tips. Basidia clavate, 4-sterigmate, 14-20 x 6-8 µm, with a basal clamp. Basidiospores cylindric to slightly ellipsoid, 7-9 x 3-3.5 µm.
Cultural characteristics. See Nunez & Ryvarden 1995.
Substrata. Most common on dead wood of Alnus, Betula, and Salix, more rarely on Corylus, Fraxinus, Populus, Pyrus, Rubus, and Sorbus, very rarely found on Picea. Distribution. A boreal species, rather common in the northern part of the Fennoscandinavian peninsula, following the forest almost to 71°N. Its presence in Japan has been confirmed with mating tests and it is in all probability continous through Asia. Due to confusion with P. melanopus, its probable presence in North America needs to be confirmed.

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