TROPICAL POLYPORES 101 



13. GANODERMA SESSILIFORME Murrill 



Pileus corky to woody, dimidiate, sessile or very slightly stipi- 

 tate, slightly conchate to fan-shaped, thickest behind, thin at the 

 margin, 3-5 X 6-9 X 1.5-2 cm.; surface laccate in places but 

 mostly covered with powdery conidia, rugose, slightly concen- 

 trically sulcate, reddish-chestnut or dull-brownish, margin pallid, 

 rather thin, sterile, slightly undulate; context corky, radiate- 

 fibrous, isabelline to isabelline-fulvous, thinner than the length 

 of the tubes; tubes about 7 mm. long, slender, 4-6 to a mm., 

 avellaneous within; mouths circular, edges entire, rather thick, 

 becoming thinner with age, pallid with a greenish-white tint; 

 spores oblong-ovoid, pointed at one end, minutely roughened, 

 thick-walled, umbrinous under a microscope, copious, 10-11X5 /*. 



Collected once on dead wood near Cuernavaca, Mexico. 



47. 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 STEREOIDES (Fries) Murrill 



Pileus coriaceous, flexible, dimidiate or flabelliform, umbonate- 

 affixed, applanate, 2 X 2-3 X 0.1-0.2 cm.; surface pale-isabel- 

 line, concentrically lineate or slightly grooved, fibrillose to 

 glabrous; margin very acute, straight, pallid, undulate or slightly 

 lobed; context thin, white to pallid, membranous; tubes 1-1.5 

 mm. long, white to pallid within, soon becoming irpiciform, 

 mouths 1-2 to a mm., irregular, at first daedaleoid, soon splitting 

 into sharp, slender, forked teeth, which are at first white or 

 yellowish, becoming avellaneous-isabelline and glistening. 



Found once on dead trunks at San Jose, Costa Rica. 



48. DAEDALEA Pers. 



Hymenophore epixylous, usually large and annual, sessile, 

 applanate to ungulate; surface anoderm, glabrous, often zonate; 

 context white or wood-colored, rigid, woody or punky ; hymenium 

 normally labyrinthiform, but varying to lamellate and porose in 

 some species; spores smooth, hyaline. 



Pileus 5-10 cm. broad. 



Furrows 5-10 mm. deep. * D- confragosa. 



Furrows 1-2 mm. deep. 2 - & favoloides. 



