NORTHERN POLYPORES 51 



the older layers, mouths circular, 2-3 to a mm., edges obtuse, 

 entire, even, melleous; spores fulvous, smooth, globose or sub- 

 globose; cystidia few, subhyaline, 100 X 20 /JL. 



Known only from a few sporophores collected on living trunks 

 of Juniperinus virginiana in Tennessee, Kentucky, and Mary- 

 land. The rot is better known than the fruit-body. 



34. PORODAEDALEA Murrill 



Hymenophore large, perennial, epixylous, sessile, conchate to 

 ungulate; surface anoderm, sulcate, usually rough; context brown 

 and woody; tubes concolorous, rarely in distinct layers, the 

 hymenium varying from porose to daedaleoid; spores smooth, 

 hyaline at maturity, becoming brownish with age; cystidia 

 conspicuous. 



i. PORODAEDALEA PINI (Thore) Murrill 



Pileus hard, typically ungulate, conchate or effused-reflexed 

 in varieties, often imbricate, 5-8 X 7-12 X 5-8 cm., smaller in 

 varieties; surface very rough, deeply sulcate, tomentose, tawny- 

 brown, becoming rimose and almost black with age; margin 

 rounded or acute, tomentose, ferruginous to tawny-cinnamon, 

 entire, sterile in large specimens; context soft-corky to indurate, 

 ferruginous, 5-10 mm. thick, thinner in small specimens; tubes 

 stratified, white to avellaneous within, becoming ferruginous at 

 maturity and in the older layers, 5 mm. long each season, much 

 shorter in thin specimens, mouths irregular, circular or daedale- 

 oid, often radially elongate, averaging I to a mm., edges fer- 

 ruginous to grayish-umbrinous, glistening when young, rather 

 thin, entire; spores subglobose, smooth, hyaline at maturity, 

 becoming brownish with age, 5-6 X 3~4 V, cystidia abundant, 

 short, 25-35 X 4-6 M- 



Very common throughout on living trunks of conifers, causing 

 a very serious heart-rot. The variation in the shape of the 

 sporophores is exceedingly confusing. 



35. GLOBIFOMES Murrill 



Hymenophore large, encrusted, perennial, epixylous, com- 

 pound; context ferruginous, punky; tubes cylindric, thick- walled, 

 stratose; spores ovoid, smooth, ferruginous. 



i. GLOBIFOMES GRAVEOLENS (Schw.) Murrill 



Hymenophore polycephalous, globose, having the appearance 

 of being thatched, 8-15 cm. in diameter, the center homogeneous, 



