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Page number:1285 
Remarks (public):S. paradoxa is here treated in a sensu lato. There is a considerable variation in connection with differences in the biotope, whether vertical or horizontal substrata, age of fruitbodies, a.s.o. but there is also a differentiation connected with the geographical distribution, which makes it probable already at a study of herbarium material, that the taxon is hetereogenous. In the northern part of its area it has normally a more irpicoid fruitbody with a coarser hymenial pattern and a lighter (whitish) colour, while in the southern part the dominating form is more poroid and has a darker colour, at least in the herbarium. There is also a difference in microscopical characteristics, e.g., in the frequency of capitate cystidiols. After having made a compatibility study of these two forms, Hallenberg (1983) has found reasons to treat them as two separate species, a more northern S. paradoxa and a southern S. radula. An investigation of the large Nordic herbarium material shows, however, that it is still in many cases difficult or even impossible to keep them separate with certainty, and for practical reasons we therefore prefer to retain S. paradoxa in a wide sense. 
Description type:Non-original description 
Description:Schizopora paradoxa (Fr.) Donk, - Persoonia 5 p. 76, 1967. - Hydnum paradoxum Fr., Syst. mycol. 1 p. 424, 1821; Elench. fung. 1 p. 150, 1828.
Fruitbody resupinate, often large, on vertical substrata often with small nodules with fertile undersides but no real pilei, tough, white to cream-coloured or darkening with age (greyish-ochraceous-brownish), 1-5 mm thick; hymenophore usually poroid with lacerate-denticulate pore walls, pores of varying sizes, often irregular or somewhat labyrinthine, on sloping substrata more or less prolonged, or split into irregular teeth in an irpicoid way; near the margin the pores are shallow or net-like; margin normally not differentiated.
Hyphal system dimitic but skeletal hyphae may be few; most hyphae with thin or somewhat thickened walls, more or less branched, 2-3 hum wide, with clamps at all septa; skeletal hyphae 3-4(-5) µm wide, straight or sinuous, hyaline or yellow, reaching a length of 100-350 µm; hyphal ends on the edges of the dissepiments encrusted with granular crystals.
Cystidia or rather cystidioid hyphae present in variable numbers, usually capitate and provided with a rounded cap of a crystalline or resinoid substance.
Basidia suburniform, 15-20 x 4-5 µm, with 4 sterigmata and a basal clamp. Spores 5-6(-6.5) x 3.5-4 µm, ellipsoid, smooth, thin-walled, usually with one oil-drop.
Habitat. On decayed frondose wood in all kinds of deciduous forests, as well as in less fertile ones with deciduous trees mixed in conifer communities.
Distribution. Very common in Denmark, S. Sweden up to the Lake Mälar-region, S. Norway along the coast to Sogn and Fjordane, and in S. Finland, but occurs also in coastal areas northwards.
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