22 WESTERN POLYPORES 



17. PH AEOLUS Pat. 



Hymenophore large, irregular, annual, spongy to corky, 

 epixylous; stipe simple, variously attached, wanting at times; 

 surface of pileus anoderm, hispid; context ferruginous; tubes 

 irregular, thin-walled; spores ellipsoid, smooth, hyaline; cystidia 

 none. 



i. PHAEOLUS SISTOTREMOIDES (Alb. & Schw.) Murrill 



Pileus spongy, circular, varying to dimidiate or irregular, 15- 

 20 cm. broad, 0.5-2 cm. thick; surface setose-hispid to strigose- 

 tomentose and scrupose in zones, ochraceous-ferruginous to 

 fulvous-castaneous or darker, quite uneven, somewhat sulcate, 

 obscurely zonate; margin yellow, rather thick, sterile; context 

 very soft and spongy, fragile when dry, sometimes indurate with 

 age, flavous-ferruginous to fulvous, 0.3-0.7 mm. thick; tubes 

 short, 2-5 mm. long, flavous within, mouths large, irregular, 

 averaging I mm. in diameter, edges thin, becoming lacerate, 

 ochraceous-olivaceous to fuliginous, rose-tinted when young 

 and fresh, quickly changing to dark-red when bruised; spores 

 ellipsoid, 7-8 X 3-4 M; stipe central to lateral or obsolete, very 

 irregular, tubercular or very short, resembling the pileus in surface 

 and substance. 



Common throughout, especially northward, on trunks, stumps, 

 and roots of various coniferous trees, causing a very serious red- 

 dish-brown rot of the roots and lower part of the trunk. 



18. COLTRICIA (Micheli) S. F. Gray 



Hymenophore annual, terrestrial or humus-loving, simple, 

 small to medium, usually circular and central-stemmed; surface 

 anoderm, brown, zonate or azonate; context yellowish or brown, 

 coriaceous to spongy; hymenium concolorous, covered with 

 yellowish or whitish powder when young; tubes thin-walled, at 

 length fimbriate; spores smooth, rounded, yellowish-brown; 

 cystidia rarely present. 



Pileus 3-6 cm. broad. i. C. perennis. 



Pileus 6-12 cm. broad. 2. C. tomentosa. 



i. COLTRICIA PERENNIS (L.) Murrill 



Pileus coriaceous, circular, infundibuliform, 3-6 cm. broad, 

 1.5-3 mm - thick; surface zonate, short- tomentose, substriate, 

 ferruginous to cinereous, the zones sometimes glabrous and 

 chestnut-colored; margin very thin, entire to lacerate, inflexed 

 when dry; context very thin, concolorous, scarcely a mm. thick; 



