36 NORTHERN POLYPORES 



times, 2-4 X 3.5-7 X 0.5-1.5 cm.; surface smooth, anoderm, 

 azonate, finely villose to glabrous, ochraceous-isabelline to bay- 

 brown; margin rather thick, entire or undulate, becoming red- 

 dish-brown when bruised; context spongy, friable when dry, 

 ochraceous-isabelline, 3-7 mm. thick; tubes rather long, slender, 

 isabelline to pale-fulvous, 3-6 mm. long, mouths angular, 

 averaging 3 to a mm., somewhat irregular with age, edges 

 isabelline, whitish when young, thin, very fragile, subentire; 

 spores ellipsoid or globose, 3 X 2.5 IJL. 



Frequent on dead deciduous wood, especially hickory, from 

 Canada southward to Virginia and Kansas. 



2. HAPALOPILUS GILVUS (Schw.) Murrill 



Pileus corky, dimidiate, imbricate, applanate or conchate, 

 3-6 X 5-10 X 0.5-1.5 cm.; surface finely tomentose to glabrous, 

 azonate, isabelline to fulvous, often marked with indistinct 

 purplish-fuscous bands, rugulose to uneven; margin thin, fer- 

 ruginous, entire to undulate, abruptly sterile; context ferruginous, 

 fibrous-spongy to corky, zonate, 3-7 mm. thick; tubes short, 

 slender, avellaneous to grayish-umbrinous within, 3-5 mm. long, 

 often found stratified, especially in the tropics, mouths small, 

 regular, circular to angular, 6-8 to a mm., edges at first thick, 

 pale-ferruginous, becoming thin, entire, glistening, olivaceous- 

 fuscous to purplish-fuscous; spores elongate-ellipsoid, 4-6 

 X 2-4 /i; cystidia chestnut-colored, ovate-subulate, 15-20 X 



4-5 M- 



Extremely common on dead deciduous wood throughout. 



Also reported common on red cedar about Washington, D. C. 



24. ISCHNODERMA P. Karst. 



Hymenophore large, annual, epixylous, sessile; surface pellicu- 

 lose, glabrous; context light-brown, fleshy to slightly corky, 

 friable when dry; tubes small, thin-walled; spores smooth, 

 hyaline. 



i. ISCHNODERMA FULIGINOSUM (Scop.) Murrill 



Pileus very large, subimbricate, laterally connate, effused- 

 reflexed, often covering the entire under surface of logs, the 

 reflexed portion applanate, 5-15 cm. long, 10 to many cm. 

 broad, 1-2.5 cm. thick; surface pelliculose, floccose, rugose, 

 zonate, fuliginous, ivory-black, and dark-fulvous, with a con- 

 spicuous resinous appearance; margin acute, concolorous, inflexed 

 on drying, entire or undulate; context fleshy, becoming corky 



