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Page number:621 
Remarks (public):In its typical aspect with a pale orange cartilaginous tubelayer, Skeletocutis amorpha is easy to recognize. However, older specimens have to examined microscopically to separate it from S. carneo-grisea which is similar but has a beige to grayish pore surface, more strongly curved, lunate spores and parallelly arranged skeletal hyphae in the trama. 
Description type:Non-original description 
Description:Skeletocutis amorpha (Fr.) Kotl. & Pouzar, Ceska Mykol. 12:103, 1958; Polyporus amorphus Fr., Syst. Mycol. 1:364, 1821. Basidiocarps annual, effused-reflexed to resupinate; pilei solitary or imbricate, dimidiate to elongated, often laterally fused, up to 2 x 4 x 0.3 cm, thin and coriaceous, upper surface whitish to gray or pale buff, zonate or azonate, tomentose to adpressed-hirsute, smooth to deeply sulcate; margin concolorous; pore surface cartilaginous in appearance, pinkish buff to reddish-orange, the pores circular to angular, 3-5 per mm, with thin, entire dissepiments; context consisting of a soft, fibrous upper layer and a firm, cartilaginous lower layer, the whole up to 1 mm thick; tube layer concolorous and continuous with the lower layer of the context, up to 1 mm thick; sections pale yellowish or reddish in KOH; taste slightly bitter.
Hyphal system dimitic; generative hyphae hyaline, becoming thick-walled, with clamps, 2-6 µm in diam; skeletal hyphae hyaline, thick-walled, aseptate, with rare branching, 3-6 µm in diam, in the trama with irregular structure; tramal hyphae similar. Cystidia none; fusoid cystidioles present, not encrusted, thin-walled, 12-18.5 x 3.5-5 µm, with a basal clamp.
Basidia clavate, 4-sterigmate, 14-16 x 4-5 µm in diam, with a basal clamp. Basidiospores allantoid, hyaline, smooth, negative in Melzer's reagent, 3-4.5 x 1.3-1.8 µm.
Type of rot. White rot of dead conifer wood.
Cultural characteristics. See Nobles 1948, 1958, 1965; Käärik and Rennerfeldt 1957; Bakshi et al. 1969; Stalpers 1978; David 1982.
Sexuality. Heterothallic and tetrapolar (Stalpers 1978).
Substrata. Dead wood of numerous genera of the Pinaceae, especially common on Pinus, but also found on Abies, Larix and Picea, very rarely on hardwoods including Alnus and Fagus.
Distribution. Widely distributed in European conifer forests north to Finnmark in Northern Norway and seemingly occurring wherever Pinus is growing. Circumglobal species in North temperate zone.
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