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Page number:687 
Remarks (public):The large sappy and partly waxy basidiocarps that dry with considerable shrinking, staining the paper in which they are wrapped, makes this rather easy to recognize. Microscopically, the chlamydospores are diagnostic.
T. fissilis has been placed in a genus of its own, Aurantioporus, together with Hapalopilus croceus (type species) which has much of the same consistency and shrinking. However, the pigments are grossly different in the two species and we prefer to keep them in separate genera.
 
Description type:Non-original description 
Description:Tyromyces fissilis (Berk. & M.A. Curtis) Donk, Med. Bot. Mus. Univ. Utrecht 9:135, 1933. - Polyporus fissilis Berk. & M.A. Curtis, Hooker's J. Bot. 1:234, 1849.
Basidiocarps annual, pileate, broadly attached, single, imbricate or more compound with several pilei along a common base, applanate to semi-ungulate and triquetrous in section, up to 10 cm wide and 20 cm long (in compound basidiocarps even larger), 412 cm thick at the base, sappy to waxy and tough when fresh, drying slowly with considerable shrinking and becoming dense and hard, with a pleasant and sweet smell; upper surface tomentose to pubescent, often scrupose to tufted, uneven and undulating, at first white, then cream to ochraceous, sometimes with a pinkish tint, margin thick to thin, rounded or sharp; pore surface white, often with pinkish tints, drying cream
coloured, pores circular to angular, 2-3 per mm, dissepiments thin, entire or slightly lacerate; context whitish, pinkish, or cream, drying slightly darker to pale umber or pallid straw-coloured, often with fine radial zones, up to 5 cm thick; tube layer up to 25 mm thick, brown, dense, colour much darker than the context, greasy and shiny when dry, stains paper in contact with sectioned tubes.
Hyphal system monomitic; generative hyphae with clamps, thick- to thin-walled, 3.5-
6 µm in diam, often with many small hyaline to pale yellowish crystals, hyphae of the ' context agglutinated in cordons or strings connected with looser or randomly arranged hyphae.
Basidia clavate, 4-sterigmate, 15-20 x 4-6 µm, with a basal clamp.
Basidiospores ellipsoid to subglobose, smooth, thin-walled, hyaline, negative in Melzer's reagent, 4-5 x 2.5-3 µm.
Chlamydospores present in the context, globose, slightly thick-walled, negative in Melzer's reagent, 4-10 µm in diam.
Type of rot. White heartrot of living hardwoods.
Cultural characteristics. See Davidson et al. 1942; Stalpers 1978; Siepmann 1971. Sexuality. Heterothallic and bipolar (Stalpers 1978).
Substrata. Living hardwoods or rarely on dead trees like Aesculus, Alnus, Betula, Castanea, Corylus, Cytisus, Fagus, Fraxinus, Juglans, Olea, Malus, Platanus, Populus, Prunus, Pyrus, Quercus, Salix, Sorbus, Tilia and Ulmus, very rarely also collected on conifers like Picea and Pinus.
Distribution. From the southern part of Fennoscandia south to Central Europe, but generally a rare species. Circumpolar in the north temperate hardwood forest zone.
 
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