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Page number:30 
Description type:Non-original description 
Description:Inonotus andersonii (Ellis et Everhart) Cerny, Fig. 3
Ceska Mycol. l7:l, 1963. - Mucronoporus andersonii Ell. et Everh., Jour. Mycol. 6:79, l890- Xanthochrous krawtzewii Pil., Bull. Soc. Mycol. Fr. 49:273, 1934.
Basidiocarps annual, resupinate, widely effused, up to 50 cm or more, hard and brittle when dry, developing under outer layers of sapwood or under bark and rupturing the bark, margin fertile in specimens studied, pore surface bright yellowish-brown to dark dull brown, often very rough and with peg-like outgrowths, becoming cracked, the pores circular to angular, very variable in size, ranging from l-6 per mm, with thick, entire dissepiments that usually become thin and deeply lacerate, context yellowish-brown to dark reddish-brown, azonate, firm, up to l mm thick, tube layer concolorous with the context or sometimes shining yellow-brown, up to l cm thick but often with peg-like extensions up to 2 cm long.
Hyphal system monomitic and generative hyphae mostly pale yellowish-brown to darker brown in KOH solution, thin- to moderately thick-walled, with occasional branching, 2.5-5 µm in diam,
Setal hyphae rare to frequent, thick-walled, 3-6 µm in diam, tramal hyphae pale yellowish to darker brown, thin- to thick-walled, 3-6 µm diam. SJEKK
Hymenial setae frequent, scarcely projecting or imbedded in the hymenial layer, subulate to ventricose, 20-45 x 8-11 µm.
Basidia clavate, l7-20 x 5-6 µm.
Basidiospores broadly ellipsoid, yellowish, thick-walled, 5.5-8 x 4-5 µm.
Substrata. Mainly on Quercus, but also on Carya.
Distribution. Eastern U.S. and Gulf Coast Regions, also in South-western U.S. to California and north to Oregon along the Pacific Coast, Korea, Japan, rare in central Europe.
Remarks. Basidiocarps of I. andersonii generally begin development under the outer rings of the sapwood and split off these outer layers as the fungus mature and begins to sporulate. The spore deposits are a bright golden yellow. I. andersonii is similar to I. obliquus in its growth habit and pathogenicity. The latter occurs mainly on birch in boreal regions and the ranges of the two species do not overlap.
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