131 



Surface minutely pubescent or tomentose between the zones ; plants usually 

 much larger. . 7 



7. Hymenium white or yellowish. 8 

 Hymenium umbrinous or fuscous. 9 



8. Tubes small, 5 to a mm., perfectly regular and entire. | C. ectypus{V>. &C. ) Pat. 

 Tubes twice as [large, often irregular from splitting; glabrous zones late in ap- 

 pearing and sometimes absent. C. pubescens (Schum.) Murrill 



9. Hymenium umbrinous ; surface opaque, with very few zones. 



C. alabamensis Murrill 

 Hymenium fuscous ; surface shining, multizonate. C. sector (Ehrenb. ) Pat. 



10. Sporophore semiresupinate, narrowly reflexed. II 

 Sporophore normally pileate, sometimes decurrent. 12 



11. Tubes I cm. or more in length. C. subluieus (E. & E. ) Murrill 

 Tubes only a few millimeters long, hexagonal, i mm. broad. 



C. hexagoniformis Murrill 



12. Margin broadly sterile, the sterile zone about 2 mm. broad. 



C. limitatus (B. & C.) Murrill 

 Margin fertile or narrowly sterile. C. bahametts (Peck) Murrill 



13. Surface brown or blackish. C. planellus Murrill 

 Surface white to isabelline. 14 



14. Margin of pileus very thin, becoming fimbriate or lacerate at maturity. 



C. Drummondii (YA.') Pat, 

 Margin of pileus not as above. 15 



15. Surface rough, scabrous ; pileus rather small, usually cuneate. 



C. Lloydii Murrill 

 Surface perfectly smooth between the zones; pileus fan-shaped. 16 



16. Surface white to ochraceous, the zones deeper yellow. C. ochrotinctellus Murrill 

 Surface isabelline with pale-latericeous zones. C. concentriais Murrill 



17. Pileus 5 mm. or more thick, tubes small and regular. 18 

 Pileus much thinner, tubes large and irregular. C. sericeohirsulus (Kl.) Murrill 



18. Surface roughly hirsute. C. nigromarginaius {?>ch-v/.) Murrill 

 Surface finely hirtose-tomentose. C. subchartaceus Murrill 



19. Pileus large, 5-10 cm. broad, 5-10 mm. thick, fibrillose-tomentose to subgla- 



brous ; confined to deciduous wood. C. biformis (Kl.) Murrill 



Pileus smaller and much thinner. 20 



20. Surface ashy-white, villose, confined to coniferous wood. 



, C. abietinus (Dicks.) Quel. 



Surface wood-colored, finely tomentose ; usually found on deciduous wood. 



C. prolificans (Fr. ) Murrill 



L. The Species of Coriolellus 



1. Pileus white or pale-isabelline. 2 

 Pileus cinereous-fuscous, glabrous. C. Si-^wo/aif (Copeland) Murrill 

 Pileus fulvous to latericeous, finely tomentose to minutely strigose. 



C. serialis (Fr. ) Murrill 



2. Surface conspicuously villose to strigose ; context very soft and spongy. 



C.cuneattis Murrill 

 Surface finely tomentose to glabrous; context firm. C. Septum (Berk.) Murrill 



