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Page number:116 
Remarks (public):Externally it resembles A.xantha. but has larger pores. Culturally the two species are also different. The spores ofA. xantha differ in being allantoid. Plank (1981) has a detailed description of A. alpina although his spore measurements are slightly confused. 
Description type:Non-original description 
Description:Antrodia alpina (Litsch.) Gilbn. & Ryv. ( Fig. 36
Mycotaxon 22:362, 1985. - Poria alpina Litsch., Osten. Bot. Zeit. 88:143., 1939. Basidiocarps perennial, resupinate, soft when fresh, becoming brittle, chalky to crumbly when dry, separable, up to 15 mm thick, bitter in taste, margin white and narrow; pore surface bright lemon to citric yellow when fresh, fading with age and drying to cream or pale tan, pores circular to angular, 2-5 per mm, dissepiments becoming thin-walled and often lacerate; context white and crumbly and distinct from tubes; tube layers whitish to cream, stratified, single layers up to 2 mm thick; basidiocarp tissue turning dark grey where touched with Melzer's reagent, purplish red where touched with 1010 KOH.
Hyphal system dimitic: generative hyphae with clamps. thin-walled and 3-5 µm in diam; skeletal hyphae predominant. sinuous to straight. unbranched, weakly to moderately amyloid in Melzer's reagent, 3-5 µm in diam; sections i n 10% KOH instantly becoming purplish red.
Cystidia none, but scattered non-projecting fusoid cystidioles present among the basidia. 15-20 x 4-5 µm, with a basal clamp.
Basidia clavate. 4-sterigmate, 14-16 x 4.5-5.5 µm. with a basal clamp.
Basidiospores oblong. fusoid at the base, hyaline. smooth, negative in Melzer's reagent, 4-5 x 2-2.5 µm.
Type of rot. Causes a brown cubical rot in dead conifers.
Cultural characteristics. See Lombard and Gilbertson 1965; Lombard 1990. Substrata. Dead conifers, especially Picea. Pinus and Larix.
Distribution. In Europe known from the mountains in Austria, Italy. Switzerland and southern Germany, widespread in North America.
 
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