WESTERN POLYPORES 27 



rimose; margin conspicuously obtuse and rounded, concolorous 

 with the younger parts of the surface; context woody, zonate, 

 melleous to dark-luteous, with a silky luster; tubes rarely strati- 

 fied, not separated by layers of context, variable in length, avel- 

 laneous, whitish-stuffed, mouths subcircular, 4-5 to a mm., edges 

 obtuse, entire, melleous to fulvous; spores broadly ellipsoid or 

 subglobose, hyaline, uniguttulate, smooth, 7-8 X 5-6 n; cystidia 

 none. 



Type collected on a willow stump near Cedro Cottage Bridge 

 on San Francisquito Creek, near Stanford University, California, 

 November 22, 1902, A. C. Herre (herb. N. Y. Bot. Card.). This 

 species is remarkably like Pyropolyporus texanus in form and 

 general appearance, but the tubes and spores are different, as 

 well as the host. It has been found but once. 



22. 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 serious heart-rot. The variation in the shape of the hymeno- 

 phores is exceedingly confusing. M tiller recently confirms 



