26 NORTHERN POLYPORES 



Common throughout, especially southward, on fallen dead 

 wood of deciduous trees. 



13. ABORTIPORUS Murrill 



Hymenophore annual, tough, humus-loving; stipe normally 

 central, often obsolete; context yellowish-white, duplex, spongy 

 above, woody below, tubes thin- walled, mouths polygonal; 

 spores smooth, hyaline. 



i. ABORTIPORUS DISTORTUS (Schw.) Murrill 



Pileus normally thin, plane or depressed, circular and centrally 

 stipitate when properly developed, but often aborted and very 

 irregular, varying to entirely resupinate forms, 6-13 cm. in 

 diameter, 0.3-1 cm. thick; surface conspicuously and compactly 

 tomentose, anoderm, azonate, smooth, white to alutaceous; 

 margin thin, undulate to lobed, concolorous; context soft and 

 spongy above, hard and woody below, white or isabelline, 3-5 

 mm. thick; tubes annual, decurrent, white, 1-5 mm. long, mouths 

 irregular, variable, 2-3 to a mm., edges thin, entire to dentate; 

 spores subglobose, 5-7 n long; stipe central, unequal, very vari- 

 able, often obsolete, resembling the pileus in surface and context. 



Frequent throughout about stumps and buried wood of 

 deciduous trees. 



14. SCUTIGER Paulet 



Hymenophore simple, terrestrial, annual, mesopous, usually 

 bright-colored; surface anoderm, variously decorated; context 

 white, rarely colored, fleshy to tough, rigid and fragile when 

 dry; hymenium porose, white or colored, tubes thin-walled ; spores 

 smooth or rarely echinulate, hyaline. 



Surface of pileus uneven, squamose or rugose, yellow. i. 5. Ellisii. 



Surface of pileus smooth, tomentose or glabrous. 

 Pileus light-colored. 



Pileus white. 2. 5. cryptopus. 



Pileus blue when fresh, changing to brown on drying. 3. S. caeruleoporus. 

 Pileus dark-colored, gray or brown. 

 Stipe black and rooting. 



Pileus smoky-brown, subtomentose; tubes regular, 



entire. 4. S. radicaius. 



Pileus drab-colored, nearly glabrous; tubes ir- 

 regular, toothed. S. 5. subradicatus. 

 Stipe neither black nor rooting. 



Pileus gray; stipe short, concolorous. 6. S. griseus. 



Pileus brown; stipe yellowish-brown, usually 



eccentric. 7. S. Whiteae. 



