NORTHERN POLYPORES 43 



thick; tubes short, about I mm. in length, pale-avellaneous 

 within, mouths irregular, circular to radially-elongate and 

 slightly sinuous, 0.5-1 mm. broad, edges becoming acute and 

 slightly toothed, white to fulvous; spores ellipsoid, smooth, 

 ferruginous, 7-8X4-5^; stipe central, spongy, tomentose, 

 fulvous, 4-6 cm. long, 5-15 mm. thick above, enlarged below, 

 1-3 cm. in thickness. 



Occasional on buried pine branches from Canada to North 

 Carolina and west to Ohio. There is little to distinguish this 

 species from P. Montagnei Fries. 



30. CRYPTOPORUS (Peck) Hubbard 



Hymenophore subglobose, sessile, epixylous; surface smooth, 

 encrusted; context white, corky; tubes white, concealed at first 

 by a volva, which is perforated at one or more points at maturity; 

 mouths constricted, discolored; spores smooth, hyaline. 



i. CRYPTOPORUS VOLVATUS (Peck) Hubbard 



Pileus simple, sessile, rarely spuriously stipitate, globose to 

 ungulate, 2-6 cm. broad, 1.5-3 cm. thick; surface white, some- 

 times slightly reddish-brown, smooth, slightly viscid or resinous 

 when young, glabrous, marked with anastomosing depressed 

 lines in larger specimens; margin very rounded, concolorous, 

 smooth, produced into a volva covering the tubes, at length 

 ruptured at 1-3 points forming small rounded or irregular aper- 

 tures; context soft-corky, homogeneous, white, 2-5 mm. thick; 

 tubes 1-1.5 mm. long, isabelline to umbrinous, mouths angular, 

 yellow with a tinge of cinnamon, 3 to a mm., edges thick, be- 

 coming thin, entire; spores oblong, hyaline or pale-flesh-colored, 

 11-13 X 4~5 M- 



Occasional throughout on dead coniferous wood. The species 

 is largely dependent on insects for its distribution. The sporo- 

 phores often emerge through insect tunnels, the volva is punc- 

 tured by insects, and the spores are carried to other trunks by 

 insects. See supplementary notes. 



31. FOMES Gill. 



Hymenophore sessile, ungulate or applanate, epixylous; 

 surface anoderm or encrusted, sulcate, rarely zonate; context 

 white, wood-colored, or flesh-colored, corky or woody, rarely 

 punky; tubes cylindric, usually thick- walled, stratose; spores 

 smooth, hyaline or subhyaline. 



