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Page number:485 
Description type:Non-original description 
Description:POLYPORUS ARCULARIUS Fr. Syst. Myc. 1:342, 1821.
FRUITBODY annual, solitary or in groups of 2-3, centrally stipitate with round pileus up to 7 cm in diameter and 1-1,5 mm thick, consistency brittle and fragile when dry. PILEUS orbicular, umbilicate or weakly infundibuliform, enrolled along the margin, first very finely tomentose, soon more glabrous and finely squamulose, concentrically rugulose when dry. Margin in young specimens with up to 1 mm long cilia, absent in older and dry specimens. Colour varying from ochraceous or even luteous to dark umber, often darker towards the margin. STIPE ochraceous to dark brown, centrally attached, up to 8 cm long and 3-4 mm in diameter, glabrous to tomentose, often slightly longitudinally wrinkled in dry condition, and with scrupose tufts of hyphae. PORE SURFACE ochraceous, chestnut or umber, often paler than the pileus, pores angular and radially elongated, 1-3 per mm, often larger towards the stipe and weakly decurrent, dissepiments thin, often slightly incised, tubes up to 1.5 mm lng, concolorous with the pore surface. CONTEXT white to straw-coloured, up to 0.5 mm thick.
HYPHAL SYSTEM dimitic, generative hyphae very thinwalled often collapsed with a few clamp connections, most easily demonstrated at the base of the basidia, 2-6 µm in diameter, binding hyphae dominating in the whole fruitbody, thick-walled and weakly branched to arboriform, up to 6 µm in diameter, distinctly tapering towards the ends. SPORES cylindrical, smooth, hyaline and thin-walled, 7-11 x 2-3.5 µm, non-amyloid.
HABITAT. On dead wood. DISTRIBUTION. The species is found throughout the tropics, subtropics and the warmer parts of the temperate zone, in Africa collected from Sierra Leone to Kenya and Tanzania, and south to South Africa.
REMARKS. The small infundibuliform pileus with cilia along the margin and the relatively large pores make the species highly characteristic.
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