NORTHERN POLYPORES 57 



forming an obtuse angle; context corky, white, concentrically 

 banded, 0.5-1 cm. thick; furrows large, labyrinthiform, radially 

 or rarely otherwise elongate, 0.5-2 cm. long, 1-3 mm. wide, 

 white or pallid, edges obtuse, often splitting into broad irpiciform 

 plates; spores smooth, hyaline, ovoid, 5-6 X 3-4 ju- 



Occasional on dead stumps and trunks of red cedarin Missouri, 

 Kansas, and Kentucky, 



3. 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-fuscous; 

 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 

 once to yellowish-brown when bruised; spores smooth, hyaline, 

 cylindric to ellipsoid, 5-8 X 2-3 p.. 



Extremely common throughout on various forms of deciduous 

 wood. This is one of the most variable species known. 



4. DAEDALEA AMBIGUA Berk. 



Pileus corky, reniform, sessile or spuriously stipitate, simple, 

 applanate, 8-12 X 10-20 X 0.5-1.5 cm.; surface glabrous, 

 smooth, azonate, polished, milk-white to yellowish, sometimes 

 purplish-black with age; margin rather thin, white, entire or 

 undulate; context floccose, zonate, white, 4-8 mm. thick; tubes 

 varying from circular to labyrinthiform, minute, white, 3 to a 

 mm. measured transversely, 4-6 mm. deep, edges thick, entire, 

 white to isabelline; spores globose, smooth, hyaline, 2-3 p. 



Occasional on dead trunks of deciduous trees in Indiana, Ohio, 

 Missouri, and southward; more frequent in the southern states. 



41. LENZITES Fries 



Hymenophore small, annual, epixylous, sessile, conchate; 

 surface anoderm, usually zonate and tomentose; context white, 

 coriaceous, flexible; hymenium lamellate, the radiating gill-like 

 dissepiments connected transversely at times, especially in 

 youth; spores smooth, hyaline. 



