56 NORTHERN POLYPORES 



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 p. 



Very common throughout on dead deciduous wood, and rarely 

 on coniferous wood. 



40. 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. 



Context isabelline; found on oak and chestnut. I. D. quercina. 



Context white; found on red cedar and very rare. 2. D. juniperina. 



Pileus thin, applanate, margin thin. 3. D. confragosa. 



Tubes less than one half millimeter in transverse diameter; 



surface white or yellowish. 4. D. ambigua. 



1. 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. 



Very common throughout on stumps, trunks, and timbers of 

 oak and chestnut. 



2. DAEDALEA JUNIPERINA Murrill 



Sporophore corky, attached by a broad, often decurrent base 

 and composed of imbricate, terraced or laterally connate, ungu- 

 late pilei 2-5 X 2-7 X 1.5-3 cm.; surface irregular, anoderm, 

 finely tomentose, yellowish-white, becoming cinereous with age; 

 marginal edge fertile, concolorous, not rounded, but often 



