Laetiporus sulphureus (Bull.: Fr.) Murrill 'European hardwood form'

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Laetiporus sulphureus (Bull.: Fr.) Murrill, Mycologia 12:11, 1920. ‘European hardwood form’.

Basidiocarps annual, laterally substipitate to sessile, imbricate, sometimes occurring in large imbricate clusters up to 100 cm or more extent; pilei dimidiate to flabelliform, up to 40 cm long, upper surface citric yellow to orange when fresh, bright ochraceous when dry, minutely tomentose to glabrous, azonate to faintly zonate, radiately furrowed; pore surface sulphur yellow when fresh, fading to pale tan on drying; pores nearly circular at first, becoming more angular in age, 2-5 per mm, with thin dissepiments that quickly become lacerate; tube layer up to 4 mm; context white to cream azonate, brittle and sappy or succulent when fresh, up to 2cm thick, rapidly becoming crumbly and white in old deteriorating specimens; taste and oder nut like, pleasant. Hyphal system dimitic; contextual generative hyphae thin-walled, hyaline, simple-septate, with rare branching, up to 15 µm in diam.; contextual binding hyphae firm- to thick-walled, hyaline, nonseptate, much branched and interlocking, up to 18 µm in diam.; tramal generative hyphae thin-walled, hyaline simple-septate, 2.5-5.0 µm in diam.; tramal skeletal hyphae thick- to firm-walled, 2.5-5.0 µm in diam. Basidia clavate, 4 sterigmate, 11- 26 ×6-7 µm. Basidiospores ovoid to ellipsoid, hyaline, smooth, IKI-, CB-, 5.0-7.0 ×3.5-5.0 µm, L = 6.0µm, W = 4.4 µm, r = 1.38, R = 1.20-1.66.

Substrata: hardwoods, particularly common on Quercus spp. but also on Castanea, Eucalypus, Fraxinus, Malus, Prunus, Salix spp. and Pyrus communis. It was also recorded common on Taxus spp. (Ota et al in preparation), occurring on living and dead standing and fallen trees, stumps, and utility poles.

Distribution: Throughout Europe of Quercus zone.

Type of decay : brown rot, butt rot and heart rot.

cf. Ryvarden L, Gilbertson RL, 1993. European polypores. Part 1. Fungiflora, Oslo.


子実体は1年生、通常複数の傘が重なり合って発生する。傘は扇型、傘の表面は生時はレモンイエロー色からオレンジ色、のちに色あせて淡褐色になる。子実層托は菅孔状、菅孔表面は鮮やかな黄色、孔口は2-5個/mm。傘肉は類白色から淡黄白色、新鮮時は多湿柔軟でもろい肉質、古くなり乾燥するともろく砕けやすくなる。 子実体組織の菌糸型は2菌糸型:傘肉の原菌糸は無色、薄壁、クランプをもたない、ほとんど分岐しない、径15µm以下。結合菌糸は径18 µm以下。実質組織の原菌糸は薄壁、無色、クランプを欠く、径2.5-5.0µm。結合菌糸は厚壁、無色、径2.5-5.0µm。 担子器は4小柄、大きさ11- 26 ×6-7µm、基部にクランプを欠く 担子胞子は楕円形~卵形、無色、平滑、IKI-, CB-, 5.0-7.0 ×3.5-5.0 µm, L = 6.0µm, W = 4.4 µm, r = 1.38, R = 1.20-1.66.