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Page number:106 
Remarks (internal):Morphologically and to lesser extent anatomically variable species. Divided here into four varieties, though single specimens cannot always definitely be placed in any of them. However, the variation seems to reflect some genetic-ally controlled infraspecific differentiation within the species 
Description type:Non-original description 
Description:Phellinus igniarius (L. ex Fr.) Quélet Enchiridion fungorum: 172. 1886.
Polyporus igniarius L. ex Fries, Systema mycologicum I: 375. 1821. Type: no original designation, lectotype: "Polyporus igniarius (L.)", [Sweden,] Upsaliae [, Salix sp.] (handwriting of E. Fries; UPS, selected here).-Fomes igniarius (L. ex Fr.) Fries, Summa vegetabilium Scandinaviae II: 321. 1849.-Ochroporus igniarius (L. ex Fr.) Schroeter in Cohn, F., Kryptogamen-Flora von Schlesien III. Die Pilze Schlesiens: 487. 1888 [not 1889].
Trametes inaequalis Karsten, Hedwigia 29: 177. 1890. Lectotype: [Finland, Tammela,] Mustiala, Myllyperä ad Alnum incan., 19. IX. 1890 [P. Karsten] (handwriting of P. Karsten; H, sel. Lowe [1956: 122] and in herb.).-See Discussion.
Fomes borealis Lloyd, Mycol. Writings C. G. Lloyd 4: 247. 1915. Holotype: Canada, Ontario, 1907 Lloyd 35528 & 35529 (BPI).
Polyporus laccatus VelenovskÀ½, ?eské houby IV-V: 678. 1922. No type selected, original material in PRM.
Polyporus foeniculaceus VelenovskÀ½ (nom. prov.), ?eské houby IV-V: 678. 1922. Lectotype: [Czechoslovakia,] Bohemia, Mnichovice, Alnus, 1921 VelenovskÀ½ 710171 (PRAT, set. F. Kotlaba 1971 in herb.).
Fomes trivialis Bresadola, Iconographia mycologica XX: 995. 1931.-See P. igniarius var. trivialis
Fruit body perennial, single or in groups, sessile or seldom effused-reflexed or very seldom thickly resupinate, woody-hard, attached to substrate broadly and firmly. (Figs. 15, 22-24).
Pileus 3.5-25 cm wide, 2.5-13 cm thick at base, projecting 3-15 cm from substrate, and reaching still greater dimensions in old age.
Shape very variable: (1) Typical pilei when young semi-spherical, later thick and obtuse, when old thickly applanated to ungulate; with 2-4 cm wide, thick and broadly rounded mar-gin; 1.5-3 cm thick context; broad and even zones, and few fissures in crust. (2) Triquetrous fruit bodies, very variable in size; with sharp, 0.3-0.5 cm wide margin; ca. 1 cm thick context; narrow zones on black and rather even upper surface criss-crossed by fissures; oblique hymenial surface normally with a tendency to effused growth; often effusedreflexed or small and almost totally effused(Jahn 1963, Fig. 6: k-o). (3) Fruit bodies round or round-edged and broad-zoned when young; with 0.4-2 cm wide margin; 0.8-1.5 cm thick context; with light ash grey, smoothly zoned crust; the edge becoming increasingly acute with age, the crust turning black in old parts and becoming cracked to rimose. (4) Bracket-shaped fruit bodies with roundish edge: sulcate, dark grey to black and matt crust with few fissures and rather deep furrows, and even, almost horizontal hymenial surface. In addition, pilei of many intermediate and deviating shapes can be found.
Crust 0.05-1 mm thick, varying with age and fruit body type, in section black and glassy-hard.
Hymenial surface even, olivaceous brown to light Cinnamon brown, grey in winter and spring before growing season, matt. Pores irregularly arranged (as seen in transverse section, Fig. 32). (3-) 4-6 per mm, round or somewhat ellipsoid, 0.10-0.18 mm in inner diameter; dissepiments 0.03-0.10 (-0.20) mm, very variable and often thick in relation to pore size. Edges matt, rounded.
Context and tubes in section Cinnamon brown, tubes indistinctly stratified, old tubes filled with cream mycelium. Core absent, or if present. rudimentary, 7-9 (-12) mm in diam., marmorate with (lark brown flecks, next to substrate.
Spores (5.0-) 5.6-6.8(-7.0) x (4.1 -)4.6-6.0 (-6.2) µm, single, subglobose, with rounded supra-apicular region. Wall of medium thickness, 0.5-0.8 µm, smooth, colourless. Apiculus ca. 0.6 x 0.6 µm. Spores hyaline, nonamyloid, indextrinoid, acyanophilous. (Fig. 20).
Basidia clavate, (8-) 9.5-11 x 6-7 µm, with four sterigmata 2.5-1 µm long. Basidioles 8.5-10 x 6-7 µm. Bases of basidia and basidioles glued together and remaining after collapse of cells as honeycomb structure with openings 5-6 µm in diam., walls 1-1.2 em thick and 4-5 µm high. Hymenial setae (12.0-)13.5-18.0(-22.0) x (4.4-)5.4-7.5(-9.0) µm, index (1.6-)2.3-2.7 (-2.9). Setae usually numerous, sometimes few, reddish brown, subulate, with rather stout apex, sometimes with heel. Subhymenium indistinct.
Hyphal system dimitic. Hyphae nonamyloid, indextrinoid, acyanophilous, skeletals darkening in KOH.
Hyphae in hymenial trama interwoven (Fig. 31). Generative hyphae 2.0-3.0 (-3.5) µm, thin-walled, hyaline, branched, simple-septate. Skeletal hyphae often thick, 2.7-4.5 (-6.0) µm in diameter, unbranched, rarely simple-septate, wall 0.9-1.7 µm, brown.
Context hyphae interwoven or radially sub-parallel, skeletals thick-walled, up to 1.5- 5.o µm in diam.
Core setae 25-50 (-100) µm long, 6-18 µm in diameter, with fragile reddish brown walls 2-7 µm thick, lumpy or tubular, irregular, often attached to each other, sometimes with pointed tips. Skeletals in core smoky brown, 3-4.5 µm in diam., generative hyphae hyaline, 2-4 µm thick, with inflated parts up to 9 µm in diam.
Very common everywhere in Fennoscandia. Parasite and saprophyte of all deciduous tree species, in both natural and man-influenced environments. Economically harmful pathogen of timberwood (especially Betula) and park trees (Salix and others). Very rarely on Populus tremula and Tilia species.

 
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