MURRILL : POLYPORACEAE OF NORTH AMERICA 361 



10. Cerrenella gen. nov. 



Type : Irpex tabacimis B. & C. Grevillea I : 102. 1872. 



Hymenophore thin, effused-reflexed, annual, epixylous ; sur- 

 face brown, zonate, anoderm, margin thin : context thin, coria- 

 ceous, brown ; hymenium at first poroid, very soon becoming 

 irpiciform, the teeth irregular and compressed : spores smooth, 



hyaline. 



Synopsis of tin- >»or(li American species 



Hymenium concolorous, teeth bright-brown in color. I. C. tabacina. 



Hymenium of a different color from the pileus, teeth covered with a greenish bloom. 



2. C. coriacea. 



i. Cerrenella tabacina (B. & C.) 

 Irpex tabacinus B. & C. Grevillea 1 : 102. 1872. 



Described from plants collected by Curtis in the Carolinas. Its 

 favorite host is decaying limbs of oak. 



Ravenel, Fung. Car. 3 : 22 ; Georgia, Ravenel ; Florida, Lloyd, 

 Calkins ; Louisiana, Langlois ; Missouri, Demetrio.. 



2. Cerrenella coriacea (B. & Rav.) 

 Irpex coriaceus B. & Rav. Grevillea 1: 10 1. 1872. 



Described from Ravenel's South Carolina collections on dead 

 oak branches. According to Berkeley, this species was described 

 by Leveille from Bogota as Hydnnm trachyodon (Ann. Sci. Nat. III. 

 5: 302. 1846) and was likewise found by Wright in Cuba ( /. 

 trachyodon B. & C. Jour. Linn. Soc. Bot. 10: 326. 1868. 



South Carolina, Ravenel ; Alabama, Peters ; Iowa, Hohvay. 



Species inouirendae 

 Irpex pityrens B. & C. Described from small specimens col- 

 lected by Bennett in Rhode Island. 



1 1. Nigroporus gen. nov. 



Type : Polyporus vinosus Berk. Ann. Mag. Nat. Hist. II. 9 : 

 196. 1852. 



Hymenium annual, epixylous, dimidiate-sessile to flabelliform, 

 glabrous : context dark-brown, firm, homogeneous ; tubes short, 

 slender, thin- walled, black : spores smooth, hyaline. 



Nigroporus vinosus (Berk.) 

 Polyporus vinosus Berk. Ann. Mag. Nat. Hist. II. 9: 196. 1852. 



Described from plants collected in San Domingo. The species 

 is easily recognized by its wine-colored context. 



Cuba, Wright, Earle & Underwood 1 574, Parle & Murrill 139. 



