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Page number:42 
Remarks (internal):Polyporus arcularius is quite similar to P. brumalis but has a paler pilear surface, larger pores that are more elongated radially, and spores always longer than 7 mm. 
Description type:Non-original description 
Description:Polyporus brumalis Pers.: Fr. Fig. 9 Syst. Mycol. 1:348, 1821. Boletus brumalis Pers., Mag. Bot. (Neues) 1:107, 1794. Polyporus fuscidulus Fr., Epicris Syst. Mycol. p. 431, 1838. Polystictus substriatus. Rostk. in Sturm, Deutschl. Pilze 5:6, 1828. Polyporus luridus Berk. & Curt., Grevillea 1:37, 1872. P. vossii Kalchbr. in Voss, Material. Pilzk. Krains 2:39, 1879. P. pauperculus Speg., Bol. Acad. Nac. Cien. Cordoba 11:483, 1889. P. tucumanensis Speg., Ann. Mus. Nac. Buenos Aires 6:162, 1898. Favolus apiahynus Speg., Bol. Acad. Cien. Cordoba 23:407, 1919.. P. subarcularius (Donk) Bond., Ann. Mycol. 39:58, 1941.
Basidiocarps annual, stipitate; pilei usually solitary, sometimes several from a branched base, up to 6 cm in diameter and 5 mm thick; upper surface bronze to purplish-brown, azonate, shiny, with clusters of short, stiff, dark hairs, margin concolorous, becoming reflexed, often appearing finely fringed or ciliate; pore surface whitish or ivory, shiny, smooth, the pores angular, (1)3-4 per mm, with thin dissepiments that become lacerate, tube layer ivory, slightly decurrent on the stipe, up to 2 mm thick; context white, azonate, corky, up to 3 mm thick; stipe central, lighter coloured than the pileus, up to 4 cm long and 5 mm wide.
Hyphal system dimitic; contextual generative hyphae thin-walled, hyaline, with clamps, occasionally branched, 4-10 µm in diam, forming a cutis on the stipe and the pilear surface, except for the hairs that emerge as tufts of parallel hyphae; contextual skeletobinding hyphae hyaline, thick-walled with swellings up to 13 µm in diam, mostly 410 µm in diam, with branches tapering to 1-2 µm in diam; tramal hyphae similar, less frequently branched, 2.5-6 µm in diam. Basidia clavate, 4-sterigmate, 16-22 x 5-6.5 µm, with a basal clamp. Basidiospores cylindric, slightly curved, 6-7 x 2-2.5 µm.
Cultural characteristics. See Nobles 1948, Bakshi et al. 1969, Siepmann 1971, Stalpers 1978.
Substrata. Dead wood of numerous hardwood genera such as Acer Alnus, Arbutus,
Betula, Castanea, Corylus, Crataegus, Fagus, Fraxinus, Juglans, Malus, Populus, Prunus, Pyrus, Rhamnus, Robinia, Rubus, Quercus, Salix, Sorbus, rilia, and Ulmus, more rarely on conifers like Cryptomeria, Juniperus, Picea, and Pinus.
Distribution. Circumpolar species in the northern hemisphere. In Europe it has a strong tendency to produce basidiocarps in two periods, viz. from March to June and from late August to November. Only rarely are basidiocarps found in the summer (in contrast to P. ciliatus).
 
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