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Page number:69 
Description type:Non-original description 
Description:Aleurodiscus disciformis (Fr.) Pat. - Bull.Soc. Mycol. Fr. 10:80, 1894; Thelephora disciformis Fr., Syst. mycol. I: 443, 1821.
Fruitbody Stereum-like, with the margin slightly loosened from the substrate, usually a few centimeters in diameter, more rarely coalesced into larger fruitbodies 1-1,5 cm thick. Hymenial surface more or less finely tuberculated, when dry often cracked, whitish to light grey, sometimes with yellow tinges. Consistency dense and hard.
Hyphal system monomitic with clamped, thin- to thickwalled hyphae, 2,5-3,5 µm in diameter. The hyphae in the basal layer have thickened walls and the clamps can be difficult to demonstrate. These hyphae may superficially be called skeletal.
Basidia about 75 x 10 µm, with four sterigmata.
Spores about 15-17 x 10-12 µm, amyloid, subglobose to ellipsoid, covered with rounded irregular warts (not spines as in A. amorphus).
Cystidia of about the same size as the basidia, paraphysoid with a moniliform apex, usually abundantly covered with crystals. No acanthophyses or dendrohyphidia present.
Habitat. On trunks of old Quercus, often 1-5 m above the ground, usually in southernly exposed, locally warm and sheltered localities.
Distribution. Southern species in Fennoscandia, in Sweden scattered in the S.W. part, locally common in the area around Goteborg, also known from Hunneberg and Halleberg (Västergotland) and Värmdö off Stockholm and in Denmark from Panhule skov (Sander Jylland). In Norway known only from Bamble in Telemark. The species seems to be favoured in costal areas, at least in Fennoscandia.
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