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Remarks (internal):Aleurodiscus disciformis occurs on living broad-leaved trees, particularly on Quercus spp. The diagnostic characters of this species are the nodose-septate hyphae, moniliform hyphidia and broadly ellipsoid, verrucose basidiospores measuring 16-19 x 10-12 µm. 
Description type:Non-original description 
Description:Aleurodiscus disciformis (de Candolle: Fries) Patouillard, Bull. Soc. Mycol. France 10: 80, 1894. Fig. 1)
Thelephora disciformis DC., Flora. France 6: 31, 1815.
Distribution: Africa, Europe and North America. New to Japan.
Basidiomata discoid, sometimes uneven in the outline of the margin, 0.3-2 mm in diam, 0.3-1.5 mm thick; hymenial surface white, "Buff" to grayish buff in the herbarium; abhymenial surface brown to dark brown, smooth. In vertical section, subhyaline, ceraceous. Hyphal system monomitic; hyphae 2-4 µm in diam, smooth, thin- to thick-walled (up to 1.5 µm), nodose-septate; hyphidia cylindrical with several constrictions at the upper part, sometimes moniliform, with a basal clamp, smooth, thin- to thick-walled (up to 1 pm); basidia clavate, 60-90 x 10-12 µm, with a basal clamp, producing 4 sterigmata; basidiospores broadly ellipsoid, 16-19 x 10 x 12 µm, verrucose (warts up to 0.5 µm in length), thick-walled (0.25-0.5 µm thick), amyloid.
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