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Page number:39 
Remarks (internal):The large, radially elongated pores are the distinguishing feature of Polyporus arcularius. This character is also found in P. alveolaris, which usually differs in having laterally stipitate or substipitate basidiocarps, and having much larger spores. R brumalis var. megalopora Kreisel (Kreisel 1963) also has more or less radially elongated, diamond-shaped pores. Mating tests between both species are negative because of their different nuclear behaviour (David & Dequatre 1982). Basidiocarp development in P. arcularius has been studied by Kitamoto et al. (1974). 
Description type:Non-original description 
Description:Polyporus arcularius Batsch: Fr. Fig. 8 Syst.Mycol. 1:342, 1821. Boletus arcularius Batsch, Elench. Fung., p. 97, 1783. Polyporus intermedius Rost. in Sturm, J. (ed.) Deutschl. Pilze 14:23, 1838. P. umbilicatus Junghuhn, Praem. Fl. crypt. Java Insul. p. 72, 1840. Favolus ciliaris Mont., Ann. Mag. Nat. Hist. Sci. Nat. 2, 20:364, 1843. Polyporus agariceus Berk., Ann. Mag. Nat. Hist. 10:371, 1843. P. anisoporus Delast. & Mont., Ann. Mag. Nat. Hist. 3, 4:357, 1845. P. nanus Dr. & Mont., Syll. gen. Spec. p. 153, 1856. Favolus curtisii Berk., Grevillea 1:68, 1872 . F. squamiger Berk., Grevillea 1:166, 1872. Polyporus orbicularis Sauter, Hedwigia 3:150, 1876. Hexagonia hondurensis Murr., Bull. Torrey Bot. Cl. 31:331, 1904. H. portoricensis Murr., Bull. Torrey Bot. Cl. 31:331, 1904. Polyporus arculariformis Murr. Torreya 4: 151, 1904. P. arculariellus Murr., Bull. Torrey Bot. Cl. 31:35, 1912. P. handelii Lohw., Symb. sinicae 2:45, 1937.
Basidiocarps annual, centrally stipitate; pilei circular, solitary, up to 2.5 cm in diameter and 3 mm thick; upper surface straw-coloured to dark-brown, azonate, glabrous, smooth to squamulose, margin ciliate, acute, sterile below; pore surface cream-coloured to buff, dull, rough, the pores large, hexagonal, radially aligned, 1(2) per mm, the dissepiments thin, becoming lacerate; tube layer concolorous and continuous with the context, up to 2 mm thick; context whitish to buff, azonate, tough, less than 1 mm thick; stipe central, concolorous with the pileus, glabrous, up to 3.5 cm long and 4 mm thick
Hyphal system dimitic; generative hyphae hyaline, thin-walled, often branched, with abundant clamps, 2.5-5 µm in diam; skeleto-binding hyphae thick-walled, aseptate, with dendroid branching tapering with narrow tips, 2-11 µm in diam; hyphae on the pileus surface slender, thin-walled, with clamps, 1-1.5 µm in diam; tramai hyphae similar, not readily separable. Basidia clavate, 4-sterigmate, 25-35 x 5-6 µm, with a basal clamp. Basidiospores cylindric, straight or slightly curved, 7-9 x 2.5-3 µm.
Cultural characteristics. See Nobles 1948, 1958, 1965; Nakasone & Gilbertson 1978.
Substrata. Dead wood of numerous hardwood genera like Acer, Alnus, Betula, Castanea, Cornus, Crataegus, Eucalyptus, Fagus, Fraxinus, Juglans, Malus, Populus, Prunus, Pyrus, Rhamnus, Robinia, Rosa, Quercus, Sorbus, rilia, and Ulmus, very rarely on Picea and Juniperus, in the tropics on numerous other genera. Distribution. Cosmopolitan species except for the boreal region. .
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