6 NORTHERN POLYPORES 



Pileus not marked with glabrous zones, but 

 nearly uniform in color and rarely shining; 

 narrowly reflexed. 3. C. subluteus. 



Pileus entirely glabrous at maturity. 



Surface brown or blackish, multizonate. 4. C. planellus. 



Surface white to isabelline or pale-fulvous, 

 multizonate, the zones usually pale- 

 latericeous. 



Surface rough, scabrous. 5. C. Lloydii. 



Surface very smooth and glabrous. 6. C. concentricus. 



Surface of pileus clothed entirely with a conspicuous 



hairy covering. 



Surface roughly hirsute. 7. C. nigromarginatus. 



Surface finely hirtose-tomentose. 8. C. subchartaceus. 



Tubes soon breaking up into long, irpiciform teeth. 



Plants large, 5-10 cm. broad. 9. C. molliusculus. 



Plants much smaller and always very thin. 



Surface ashy-white, villose; plants confined to coni- 

 ferous wood. 10. C. abietinus. 

 Surface wood-colored, tomentose; plant found on 



both deciduous and coniferous wood. n. C. prolificans. 



I. CORIOLUS VERSICOLOR (L.) Quel. 



Pileus densely imbricate, very thin, dimidiate, conchate, 

 2-4 X 3-7 X 0.1-0.2 cm.; surface smooth, velvety, shining, 

 marked with conspicuous, glabrous zones of various colors, 

 mostly latericeous, bay, or black; margin thin, sterile, entire; 

 context thin, membranous; tubes punctiform, less than I mm. 

 long, white to isabelline within, mouths circular to angular, 

 regular, even, 4-5 to a mm., edges thick and entire, becoming 

 thin and dentate, white, glistening, at length opaque-isabelline 

 or slightly umbrinous; spores allantoid, 4-6 X 1-2 ju. 



Extremely common throughout on all forms of dead wood. 

 It also causes a serious root-rot in many trees and is a wound 

 parasite in Catalpa. 



2. CORIOLUS PUBESCENS (Schum.) Murrill 



Pileus rather thick, imbricate, laterally connate, dimidiate or 

 flabelliform, conchate, 3-5 X 4-8 X 0.2-0.4 cm.; surface white, 

 zonate, hirtose-villose to nearly glabrous, finely radiate-lineate 

 in front at times, often radiately-furrowed or slightly plicate; 

 margin at times thin, but usually obtuse, somewhat inflexed; 

 context thin, white, fibrous, 1-2 mm. thick; tubes white, 2-4 

 mm. long, mouths angular, regular, 2-3 to a mm., edges very 

 thin, entire to denticulate, white to discolored; spores cylindric, 

 subcurved, 6-8 X 2-3 IJL. 



