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Page number:373 
Remarks (public):Laetiporus sulphureus is easy to recognize because of the yellow to pale orange, soft basidiocarps. In North America it is the most commonly eaten polypore, but this practice seems to be unknown in Europe.
L. montanus Cerny (Cerny 1990) is based on specimens found on spruce in the Carpathian mountains. Since L. sulphureus is very common on this host both in Japan and North America comparative studies are necessary to verify the status of the new species. There is available a long range of names from all continents and many different hosts if it can be proven that there exist intersterile taxa within what today is called L. sulphureus.
The basidiocarps of L. sulphureus are usually rapidly degraded in nature and are a favourite hunting place for beetle collecting entomologists.
Description type:Non-original description 
Description:Laetiporus sulphureus (Bull.:Fr.) Murr. - Mycologia 12:11, 1920. - Boletus sulphureus Bull., Herb. France, pl. 429. 1788. -Polporus sulphureus Bull.:Fr.. Syst. Mycol. I :357, 1821. - Agaricus speciosus Batt. Fung. Agric. Hist. p. 68, 1755.
Basidiocarps annual, laterally substipitate to sessile, pilei single or occurring in large imbricate clusters up to a square meter or more in extent. dimidiate to flabelliform. up to 40 cm wide; upper surface citric yellow to orange when fresh, fading to pale brownish with age or drying, minutely tomentose to glabrous, azonate to faintly zonate. radiately furrowed. margin concolorous, often undulate, rounded, sterile or fertile below; pore surface sulphur yellow when fresh. fading to pale tan on drying, the pores angular. 3-4 per mm. with thin dissepiments that quickly become lacerate; context white, azonate. brittle and sappy or succulent when fresh, drying crumbly or chalky, up to 2 cm thick. rapidly becoming crumbly and white in old, deteriorating specimens; tube layer sulphur yellow when fresh, drying pale buff. distinct, up to 4 mm thick; taste and odor nutlike. pleasant.
Hyphal system dimitic; contextual generative hyphae thin-walled, hyaline, simple-septate, with rare branching. 6-12 µm in diam; contextual binding hyphae firm-to thick-walled. hyaline, nonseptate. much branched and interlocking, 3-20 µm in diam; tramal hyphae thin- to firm-walled, with occasional branching, simple-septate, 4-6 µm in diam.
Cystidia or other sterile hymenial elements lacking.
Basidia clavate, 4-sterigmate, 20-25 x 6-9 µm, simple-septate at the base. Basidiospores ovoid to ellipsoid. hyaline. smooth. negative in Melzer's reagent, 5-8 x 4-5 µm.
Type of rot. Brown cubical butt rot of living hardwoods and conifers, also on dead standing and fallen trees, stumps, and utility poles. White mycelial felts are prominent in shrinkage cracks in the decayed wood; negative in gum guaiac solution.
Cultural characteristics. See Davidson et al. 1942; Nobles 1948, 1958, 1965; Stalpers 1978. Conidia are produced in profusion in cultures.
Sexuality. Unknown.
Anamorph. Sporotrichum versisporum (Lloyd) Stalpers. See Stalpers 1984. Ptychogastric stage known as Ceriomyces aurantiacus Pat. and collected several times in Central Europe (see Jahn 1970 for details).
Substrata. In Europe, L. sulphureus almost exclusively restricted to hardwoods and is particularly common on Quercus but is registered on other host genera like Castanea, Eucalyptus. Fraxinus. Malus, Prunus, Salix spp.and Pyrus communis as the most common. Kotlaba (1984) has a long list of other occasional hosts. In Europe also recorded rarely on conifers like Abies, Larix, Picea and Taxus. In eastern America on the same range of hosts as in Europe. in western North America and East Asia predominantly on coniferous wood. In the tropics on numerous other hosts.
Distribution. In Europe L. sulphureus follows the Quercus zone everywhere and produces its basidiocarps in spring and early summer. It is a cosmopolitan species which in western North America and northeast Asia also occurs frequently on conifers. In tropical areas the basidiocarps often attain a more orange colour. The earliest name for this form is Polyporus discolor Kl. 1833.
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