SOUTHERN POLYPORES 57 



40. 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 

 nearly glabrous behind; margin acute, undulate to lobed, paler, 

 zonate, strigose-tomentose ; context very thin, membranous, 

 white, homogeneous, scarcely I mm. thick; tubes decurrent, 

 labyrinthiform, 1-3 mm. long, white or isabelline to fuliginous or 

 umbrinous, averaging 2 to a mm., edges acute, uneven, soon 

 becoming dentate-lacerate, giving the hymenium an irpiciform 

 appearance; spores ovoid, smooth, hyaline, 4-6 X 3-4 M. 



Very common throughout on dead deciduous wood, and rarely 

 on coniferous wood. This species has recently been found in 

 Europe to be parasitic on horsechestnut, beech, black locust, 

 and red maple. 



41. 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. 



Tubes one to several millimeters in transverse diameter; surface 



usually brown or discolored. 



Pileus thick, triangular, margin obtuse. i. D. quercina. 



Pileus thin, applanate, margin thin. 2. D. confragosa. 



Tubes less than one half millimeter in transverse diameter; 



surface white or yellowish. 3. D. ambigua. 



i. DAEDALEA QUERCINA (L.) Pers. 



Pileus corky, rigid, dimidiate, sessile, imbricate, applanate, 

 convex below, triangular in section, 6-12 X 9-20 X 2-4 cm.; 

 surface isabelline-avellaneous to cinereous or smoky-black with 

 age, slightly sulcate, zonate at times, tuberculose to colliculose 

 in the older portions; margin usually thin, pallid, glabrous; con- 



