32 WESTERN POLYPORES 



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- 



Reported by Harkness as common in California. It occurs 

 usually 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. 



27. 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 thick, triangular, margin obtuse. I. D. quercina. 



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



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- 

 text isabelline, soft-corky, homogeneous, 5-7 mm. thick; tubes 

 labyrinthiform, becoming nearly lamellate with age in some 

 specimens, 1-2 cm. long, 1-2 mm. broad, chalk-white or dis- 

 colored within, edges obtuse, entire, ochraceous to avellaneous. 



Reported by Harkness as occurring on oak in California. 



2. DAEDALEA CONFRAGOSA (Bolt.) Pers. 



Pileus corky to woody, imbricate, sessile, dimidiate, convex 

 or plane above, variable in size, 2-7 X 3-10 X 0.5-1.5 cm.; 

 surface multizonate, rugose, scrupose, often tuberculose, becom- 

 ing glabrous, isabelline or avellaneous to latericeous-f uscous ; 

 margin thin, entire to lobed, pallid, fertile, dark-brown when 

 bruised; context corky to woody, white to avellaneous, zonate, 

 3-10 mm. thick; tubes very variable, porose or labyrinthiform, 

 often becoming lamellate with age, 0.5-1.5 mm. broad, 5-10 

 mm. deep, white or avellaneous within, mouths grayish-pruinose 

 when young, becoming umbrinous or reddish-fuscous, edges 

 thin, becoming lacerate-dentate and often fimbriate, turning at 



