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Page number:230 
Remarks (public):The large irregular pores and the black layer separating the upper tomentum from the lower context are distinctive field characters for D. mollis. 
Description type:Non-original description 
Description:Datronia mollis (Sommerf.:Fr.) Donk - Persoonia 4:338, 1966. - Daedalea mollis Sommerf.:Fr., Elench. Fung., p.71, 1828. -Daedalea mollis Sommerf.. Suppl. Fl. Lapp. p. 271, 1826.
Basidiocarps annual, usually effused-reflexed, occasionally resupinate or sessile, reflexed up to 2 cm; upper surface of pileus dark brown to black. strigose to glabrous, concentrically zonate and sulcate; pore surface buff to umber brown, the pores angular to daedaleoid. 1-2 per mm, some over 1 mm wide, dissepiments becoming thin and splitting; lower context pale buff, firm-fibrous, azonate, up to 1 mm thick, separated from dark brown upper layer of tomentum by a thin, black layer; tube layer concolorous with lower context, up to 3 mm thick.
Hyphal system trimitic; contextual generative hyphae hyaline. thin-walled, with clamps, 2.5-4 µm in diam; contextual skeletal hyphae thick-walled, nonseptate, those in lower context pale greenish-brown in KOH, those in upper dark layer darker brown in KOH, 2.5-4 µm in diam; contextual binding hyphae thick-walled, non-septate. much branched 2-3 µm in diam; tramal hyphae similar to those in lower context. Dendrohyphidia branched and contorted. present on dissepiment edges, 1.5-3 µm in diam.
Cystidioles fusoid. thin-walled, imbedded or slightly projecting. 25-30 x 4-5 µm, with a basal clamp; hyphal pegs present.
Basidia clavate with a narrow base, 4-sterigmate, 25-30 x 5-6.5 µm, with a basal clamp. Basidiospores cylindric, hyaline, smooth, negative in Melzer's reagent, 10-12 x 3-4 µm.
Type of rot. White rot of dead hardwoods, black zone lines are conspicuous in the decayed wood.
Cultural characteristics. See Nobles 1958; David 1967.
Sexuality. Heterothallic and tetrapolar (David 1967).
Substrata. Dead wood of numerous hardwood genera such as Acer, Aesculus, Almus, Betula, Carpinus, Corylus, Fagus, Frangula, Fraxinus, Malus, Populus, Prunus, Quercus, Robinia, Salix, Sorbus, Tilia and Ulmes. very rarely on Abies and Pimus. Distribution. Throughout Europe from the North Cape area to the Mediterranean. Cosmopolitan species, recorded from all continents.
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