NORTHERN POLYPORES 55 



brown within, mouths circular or angular, white or grayish- 

 brown, edges thin, entire; spores ovoid, obtuse at the base, 

 attenuate and truncate at the apex, smooth, yellowish-brown, 

 9-11 X 6-8 /z; stipe laterally attached, usually ascending, irre- 

 gularly cylindric, 1-4 X 0.5-1.5 cm., resembling the pileus in 

 color, surface, and substance, often obsolete. 



Frequent on diseased trunks and dead stumps of both de- 

 ciduous and coniferous trees from New England to Ohio and 

 Missouri and southward. Very similar in its stipitate forms to 

 Polyporus lucidus of Europe. G. subperforatum Atk., described 

 from Ohio, is probably not distinct. 



3. GANODERMA CURTISII (Berk.) Murrill 



Pileus corky to woody, reniform, convex above, concave below, 

 5-10 X 8-15 X 1-2 cm.; surface glabrous, ochraceous to lateri- 

 ceous or bay, at first laccate, the varnish soon disappearing, 

 broadly sulcate; margin obtuse to truncate, sulcate, ochraceous, 

 entire, glabrous; context soft-corky, zonate, ochraceous above, 

 fulvous below, 5 mm. thick; tubes perennial, indistinctly strati- 

 fied, 5-8 mm. long each season, avellaneous-umbrinous within, 

 mouths circular to slightly angular, 3-5 to a mm., edges 

 entire, white or cremeous, becoming umbrinous; spores ovoid, 

 attenuate and truncate at the apex, yellowish-brown, 9-11 

 X 5-8/1; stipe usually eccentric or lateral, erect or ascending, 

 equal or slightly enlarged above, cylindric, bay, laccate, the 

 substance similar to the context and darker at the center, 

 5-10 X 2-3 cm. 



Frequent from New York to Michigan and southward on or 

 about decayed trunks and stumps of oaks and other deciduous 

 trees. 



39. CERRENA (Micheli) S. F. Gray 



Hymenophore small, epixylous, sessile, conchate, annual; 

 surface anoderm, hairy or subglabrous, zonate or sulcate; con- 

 text thin, white, fibrous, flexible; hymenium at first labyrinthi- 

 form, soon becoming irpiciform from the splitting of the dissepi- 

 ments; spores smooth, hyaline. 



i. CERRENA UNICOLOR (Bull.) Murrill 



Pileus coriaceous, sessile, imbricate, dimidiate to flabelliform, 

 conchate, often laterally confluent, 2.5-3.5 X 5-10 X 0.1-0.3 

 cm.; surface villose-strigose, rugose, zonate, plicate, isabelline 

 to fulvous, becoming avellaneous with age and blackish and 



