38 NORTHERN POLYPORES 



1. INONOTUS HIRSUTUS (Scop.) Murrill 



Pileus thick, compact, fleshy to spongy, dimidiate, sometimes 

 imbricate, compressed-ungulate, 7-10 X 10-15 X 3-5 cm.; sur- 

 face hirsute, ferruginous to fulvous, azonate, smooth; margin 

 obtuse, velvety; context spongy-corky, somewhat fragile when 

 dry, ferruginous to fulvous, blackening with age, 1-1.5 cm - 

 thick; tubes slender, about I cm. long, ferruginous within, 

 mouths angular, 2-3 to a mm., ferruginous to bay, blackening 

 with age, edges thin, very fragile, lacerate; spores broadly ovoid, 

 smooth, thick-walled, deep-ferruginous, 2-guttulate, 7-8 X 5-6 /x. 



Occasional throughout on living trunks of oak and certain 

 other deciduous trees. A very abundant and destructive enemy 

 of shade trees in Europe. 



2. INONOTUS DRYADEUS (Fries) Murrill 



Sporophore of immense size, dimidiate, rarely circular, usually 

 imbricate, applanate or depressed above, convex below, fleshy 

 to spongy-corky, rather fragile when dry, 15-30 X 25-65 X 3-5 

 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 p., the outer wall hyaline, 

 the inner membrane brown; cystidia 15-35 X 5-9 /*. 



Occasional throughout as a root parasite of various species of 

 oak, the large sporophores appearing near the base of the trunk. 

 Attention is called to recent studies of this species and the next 

 by W. H. Long. 



3. INONOTUS DRYOPHILUS (Berk.) Murrill 



Pileus thick, unequal, unguliform, subimbricate, rigid, 7-8 

 X 10-14 X 2-3 cm.; surface hoary-flavous to ferruginous- 

 fulvous, becoming scabrous and bay with age; margin thick, 

 usually obtuse, sterile, pallid, entire or undulate; context fer- 

 ruginous to fulvous, zonate, shining, 3-10 mm. thick; tubes 

 slender, concolorous with the context, about I cm. long, mouths 

 regular, angular, 2-3 to a mm., glistening, whitish-isabelline to 



