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Page number:460 
Remarks (internal):All the collections belong to O. igniarius var. trivialis (Bres. ex Killerm.) Niemelä, n.comb. (Fomes igniarius [L.: Fr.] Fr. var. trivialis Bres. ex Killermann, Natürl. Pflanzenfam., 6: 192, 1928). It is a black-crusted, acute-edged variety, described more closely by Niemelä (1975, as Phellinus igniarius var. trivialis). The species is easily identified by its woody hard, brown, black-crusted, triquetrous fruit bodies. Its closest relative in the area is O. lundellii, which grows more effused, has more slender setae and less rounded spores. Further, the latter grows on Alnus crispa.
Most of the extra-regional specimens, listed below, represent another variety. They are larger, applanate, reaching 11 cm in width, projecting up to 10 cm and being up to 7 cm thick at base. The young marginal crust is light grey and smooth, but old central parts become widely black and rimose. Microscopically both varieties agree. I refrain from including these in O. nigricans (Fr.) Fiasson & Niemelä (Phellinus nigricans), but regard them as O. igniarius var. cinereus (Niemelä) Niemelä n. comb. (Phellinus igniarius [L.: Fr.] Quél. var. cinereus Niemelä, Ann. Bot. Fennici, 12: 110, 1975). This variety was collected from birches, in accordance with the situation in northern Europe (Niemelä, 1975).
Description type:Non-original description 
Description:Ochroporus igniarius (L.: Fr.) J. Schroet. (Fig. 13)
Phellinus igniarius (L.: Fr.) Quél.
Fomes igniarius (L.: Fr.) Fr.
Perennial; fruit bodies solitary, pileate or effused-reflexed, triquetrous, 3-7 cm wide, 1-4 cm thick at base, projecting 0.5-4 cm. Upper surface black or brownish black, narrowly sulcate, with a hard, cracking crust; margin acute. Pores dark brown, round, 4-6 per mm; in section tubes and context brown, woody hard. Dimitic, generative hyphae simple-septate; skeletal hyphae brown, thick-walled, intermixed, 3-5 µm in diameter; hymenial setae irregularly distributed, small, with bulbous base and very sharp, symmetrical apex, 11-15 x 4-6 µm; spores ellipsoid to subglobose, rather thin-walled, 5.6-6 x 4.5-5.2 µm, IKI-, CB + .
Saproparasitic on Salix planifolia, growing at the bases of rather thick trunks in moist, dense brook-side thickets and in water-logged sites. Causes, in the final stages, a soft white-rot. Common in suitable growth sites.

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