Pseudoinonotus dryadeus (Pers.) T. Wagner & M. Fisch. 2001

Inonotus dryadeus (Fries) Murrill
Polyporus dryadeus Fries, Syst. Myc. 1 : 374. 1821.
Sporophore of immense size, sessile, dimidiate, rarely circular, usually imbricate applanate or depressed above, convex below, fleshy to spongy-corky, rather fragile when dry, 15-30X25-65X3-5 cm.; surface very uneven, azonate, opaque, hoary-isabelline, anoderm to very thinly encrusted, subshining and bay ; margin thick, pallid, entire to undulate, weeping : context thick, zonate, subglistening, ferruginous-isabelline to fulvous, 2.5-4 cm. thick; tubes grayish-umbrinous to fulvous within, 5-15 mm. long, slender, very fragile, mouths whitish when young, becoming somewhat resinous in appearance and finally bay-brown, at first minute, circular, becoming angular, 4 to a mm., edges thin, fimbriate to lacerate, deeply splitting and separating with age : spores subglobose, smooth, 8-10 X 7-8 y", the outer wall hyaline, the inner membrane brown ; cystidia 15-35 X 5-9 /ti.
Type locality : Sweden. Habitat : Trunks of various species of oak.
Distribution : Eastern United States west to Kentucky ; also in Europe.