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Page number:92 
Remarks (public):easy to identify even in the field, by the discoid with more or less reflexed margin, and the growing on bark of Quercus.
Description type:Non-original description 
Description:Aleurocystidiellum disciforme (DC.) TellerÀ­a, Biblthca Mycol. 135: 25, 1990.
Bas.: Thelephora disciformis DC., in de Candolle & Lamarck, Fl. franç., Edn 3 (Paris) 5/6: 31, 1815. Syn.: Aleurodiscus disciformis (DC.) Pat., Bull. Soc. mycol. Fr. 10(2): 80, 1894.
Basidiome discoid, with reflexed margin easily separable from the substrate, more or less coriaceous, hymenophore smooth to tuberculate, greyish, reflexed part brown greyish coloured. Hyphal system monomitic, hyphae with clamps, thin- to slightly thick-walled, 2.5 x 3.5 µm wide, hyaline, some subicular hyphae resemble skeletal hyphae. Gloeocystidia moniliform, 70-80 x 5-10 µm, SA+, more or less thick-walled; no acanthophyses, neither dendrohyphidia or paraphysoid hyphae. Basidia cylindrical to subclavate, 70-80 x 9-13 µm, with 4 long sterigmata, and a basal clamp. Basidiospores ellipsoid to subglobose, 17-18 x 10-12 µm, with irregular warts, amyloid.
Distribution in Europe: Poland, France, Germany, Croatia, Bosnia and Herzegovina, Macedonia, Serbia, Slovenia, Slovenia, Romania, Bulgaria, Portugal, Sweden, Denmark, Norway, Switzerland, Italy, Spain, Ukraine, Netherlands, Russia, and the Caucasus. It seems to have a wide distribution in Europe. In Italy it occurs in Piemonte, Lombardia, Trentino Alto-Adige, Emilia-Romagna, Lazio and Sardegna.
Substrata: always on Quercus ilex.
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