WESTERN POLYPORES 29 



of conidia; margin obtuse, broadly sterile, white or slightly 

 cremeous, entire to undulate; context corky, usually rather 

 hard, zonate, fulvous to bay, 5-10 mm. thick, thinner with age; 

 tubes very evenly stratified, separated by thin layers of context, 

 5-10 mm. long each season, avellaneous to umbrinous within, 

 mouths circular, 5 to a mm., whitish-stuffed when young, edges 

 obtuse, entire, white or slightly yellowish to umbrinous, quickly 

 changing color when bruised; spores ovoid, smooth or very 

 slightly roughened, pale-yellowish-brown, truncate at the base, 

 7-8 X 5-6 M- 



Very common throughout on dead or diseased trunks of oak, 

 willow, alder, and many other deciduous trees, as well as on 

 conifers in certain sections, causing decay of the sapwood and 

 exposed heartwood. The immense hymenophores are often used 

 by amateur artists for etching. 



2. ELFVINGIA BROWNII Murrill, sp. nov. 



Pileus encrusted, very hard, dimidiate, applanate, broadly 

 attached, subimbricate, 8-10 X 15-25 X 3-4 cm.; surface gray 

 to brown, glabrous, concentrically sulcate, rather uneven, margin 

 very obtuse, broadly sterile, luteous, subentire; context almost 

 woody, zonate, bay, about 3 cm. thick, thinner with age; tubes 

 5-8 mm. long each season, avellaneous to dark-umbrinous within, 

 mouths minute, circular, about 5 to a mm., luteous-stuffed when 

 young, edges obtuse, entire; spores broadly ellipsoid, slightly 

 roughened, brown, uniguttulate, truncate at one end, thick- 

 walled, 8-9 X 7 M- 



Type collected on decaying logs of Umbellularia in Strawberry 

 Canyon, University of California campus, Berkeley, California, 

 September 27, 1913, V. S. Brown 307 (herb. N. Y. Bot. Card.). 

 Also collected in a younger stage at the same place on the same 

 host, September 12, 1913, V. S. Brown 306. This species re- 

 sembles E. megaloma in habit and appearance, but the hymenium 

 is luteous instead of white when young. 



3. ELFVINGIA TORNATA (Pers.) Murrill 



Pileus hard, dimidiate, sessile or spuriously stipitate, applanate, 

 thin, very large, plane below, 10-20 X 15-30 X 1-5 cm.; surface 

 horny-encrusted, sulcate, glabrous, slightly tuberculose, conidia- 

 bearing, opaque to subshining, often fasciate with black bands, 

 subspadiceous to fulvous; margin smooth, sterile, often laccate, 



