NORTHERN POLYPORES 41 



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 nmbriate; spores smooth, rounded, yellowish-brown; 

 cystidia rarely present. 



Pileus concentrically zonate; context very thin. 



Pileus shining-cinnamon, strigose, striate, thin, flexible, 

 slightly depressed, the margin often fimbriate or pseudo- 

 ciliate. i. C. cinnamomea. 



Pileus dull-rusty-cinnamon to hoary, velvety to glabrous, 

 deeply depressed, the margin thicker and less fim- 

 briate. 



Tubes small, 0.5 mm. or less in diameter. 2. C. perennis. 



Tubes large, i mm. in diameter. 3. C. focicola. 



Pileus usually azonate; context rather thick and spongy. 



Context duplex, soft above and woody below; hymenium 



beset with cystidia. 4. C. tomentosa. 



Context homogeneous; hymenium free from cystidia. 5. C. obesa. 



I. COLTRICIA CINNAMOMEA (Jacq.) Murrill 



Pileus coriaceous, thin, circular, umbilicate, sometimes deeply 

 so, 1-4 cm. in diameter, 1-2 mm. thick; surface bright-cinnamon, 

 cinereous, shining, strigose-striate, zonate; margin undulate to 

 slightly lobed, nmbriate, concolorous; context membranous, 

 concolorous, less than a mm. thick; tubes pale-umbrinous 

 within, 1-2 mm. long, slightly decurrent, mouths rather large, 

 angular, ferruginous to fulvous, 2-3 to a mm., edges thin, fimbri- 

 ate-dentate, collapsing with age; spores ellipsoid, pale-yellowish- 

 brown, smooth, 6-8X4-6/1; stipe central, velvety, reddish- 

 fuscous, nearly equal, 2-4 cm. long, 3-5 mm. thick. 



Common throughout on mossy soil or wood almost reduced to 

 humus. 



2. 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; 

 tubes short, grayish-umbrinous within, 1-3 mm. long, mouths 

 small, angular, 2-4 to a mm., whitish when young, becoming 

 fulvous, edges thin, dentate to lacerate, soon collapsing; spores 

 ovoid, smooth, pale-yellowish-brown, 4-6 X 2-3.5 n; stipe bul- 

 bous and often united with that of neighboring plants at the 

 base, tapering upward, velvety, ferruginous to fulvous, solid, 

 corky, 3-5 cm. long, 2-5 mm. thick. 



