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Page number:75 
Description type:Non-original description 
Description:Aleurodiscus disciformis (DC.: Fr.) Pat. Fig. 27
Bull. Soc. mycol. Fr. 10: 80, 1894. - Thelephora disciforme DC.: Fr., Syst. mycol. 1: 443, 1821. - Thelephora disciforme DC., in Lamarck & Poiret, Encylop. Meth. Bot. p. 31, 1815.
Basidiocarp discoid to stereoid, with the margin slightly loosened from the substrate, usually a few cm in diam., more rarely coalesced into larger basidiocarps 1-1.5 cm thick, hymenophore more or less finely tuberculate, when dry often rimose, whitish to light grey, sometimes with yellow tinges, consistency dense and hard.
Hyphal system monomitic with clamped, thin- to thick-walled hyphae, 2.5-3.5 µm in diam., in the subiculum with thickened walls and clamps which can be difficult to demonstrate; these hyphae may superficially be called skeletal hyphae; below the subhymenium the hyphae are usually covered with angular crystals. Acanthophyses absent. Gloeocystidia cylindrical to more commonly moniliform, 60-120 x 5-10 µm, smooth or usually abundantly covered with crystals. Basidia about 65-75 x 8-10 µm, smooth, with 4 sterigmata. Basidiospores 15-17 x 10-12 µm (in KOH to 20 x 13 µm) µm, subglobose to ellipsoid, covered with rounded irregular warts.
Cultural characteristics. See Boidin et al. (1968). Sexuality. Tetrapolar, see Boidin et al. (1968).
Substrata. Usually on the bark of old Quercus trees, often 1-5 µm above the ground, but also recorded from hosts like Acer, Tiha and Cinnamomeum.
Distribution. Temperate species which seems to follow the genus Quercus (though absent from the British Isles). From southern part of Fennoscandia to the Mediterranean area, through Russia and Japan, to eastern part of North America.
Remarks. The species is easy to recognize by its thick pulvinate to stereoid basidiocarps with a pale cream to greyish colour.
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