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Page number:608 
Remarks (public):We have followed Hallenberg (1983) in splitting the previous complex S. paradoxa in two species. Usually S. paradoxa will have a far more split and irregular often partly hydnoid pore surface, but a microscopical examination should be done tc verify the determination. S. paradoxa has on the average larger spores, but this can moss easily be seen from spore prints where only mature spores are deposited.
Description type:Non-original description 
Description:Schizopora paradoxa (Schrad: Fr.) Donk, Persoonia 5:76, 1967; Hydnum paradoxum Schrad.:Fr., Syst. Mycol. 1:424, 1821; Elench Fung. 1:150, 1828.
Basidiocarps resupinate, often large, on vertical substrata often with small nodules with fertile underside but no real pilei, tough, white to cream-colored or darkening with age (grayish-ochraceous-brownish), 1-5 mm thick; hymenophore usually split and irregularly hydnoid with flattened teeth, or labyrinthine to lacerate-denticulate if poroid, pores of varying sizes, on sloping substrata more or less prolonged, near the margin the pores are shallow or net-like; margin normally not differentiated; subiculum cream to pale buff, fibrous, up to 2 mm thick; tube layer concolorous and continuous with context, up to 3 mm thick.
Hyphal system dimitic, but skeletal hyphae may be few; generative hyphae predominant, with thin or somewhat thickened walls, more or less branched, 2-3 µm in diam, with clamps at all septa; skeletal hyphae 3-4 (-5) µm wide, thick-walled, sinuous, hyaline or yellow, reaching a length of 100-350 µm; hyphal ends on the edges of the dissepiments obtuse, encrusted with granular crystals.
Cystidia present in variable numbers, usually capitate and provided with a rounded cap of a crystalline or resinoid substance.
Basidia suburniform, 4-sterigmate, 15-20 x 4-5 µm, with a basal clamp.
Basidiospores ellipsoid, smooth, thin-walled, usually with 1 oil-drop, negative it Melzer's reagent, 5.5-6.5 x 3.5-4.5 µm.
Type of rot. Causes a white rot of dead hardwoods.
Cultural characteristics. See Domanski 1969; Stalpers 1978; Hallenberg 1983. Sexuality. Heterothallic and tetrapolar (Domanski 1969; Hallenberg 1983). Substrata. On dead hardwoods in all kinds such as Acer, Aesculus, Alnus, Betula, Castanea, Cornus, Corylus, Cratageus, Cytisus, Eucalyptus, Euphorbia, Fagus, Fraxinus, Juglans, Malus, Olea, Phillyrea, Populus, Platanus, Prunus, Pyrus, Rhamnus, Robinia. Quercus, Salix, Sambucus, Sorbus, Tilia, Ulmus and Viburnum and numerous introducec ornamental bushes. It has also been collected on various conifers like Juniperus, Larix, Picea, Pinus, Pseudotsuga, Thuja and Tsuga.
Distribution. Widely distributed in Europe and north to 70°N in Norway, but apparently rare in Central and Southern Europe where S. radula seems to be more common.
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