WESTERN POLYPORES 19 



14. HAPALOPILUS P. Karst. 



Hymenophore annual, rarely perennial, epixylous, sessile, 

 dimidiate, simple or imbricate; surface anoderm, rarely pellicu- 

 lose, zonate or azonate, usually brown and glabrous; context 

 brown, leathery or corky, tough or rarely friable when dry; 

 hymenium usually differently colored, tubes small, thin-walled; 

 spores small, usually ovoid, hyaline. 



i. 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 

 X2~4)u; cystidia chestnut-colored, ovate-subulate, 15-20 X 

 4-5 M- 



Found once in California on Quercus agrifolia. 



15. 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 

 with age, very firm and rather fragile when dry, light-brown, 

 5-10 mm. thick; tubes pallid to umbrinous, 5-8 mm. long, 

 mouths minute, white, angular, equal, becoming umbrinous and 

 somewhat irregular with age, edges thin, fimbriate to lacerate; 

 spores cylindric, subcurved, 4-6 X 1.5-2 /*. 



