26 WESTERN POLYPORES 



furrowed; context creamy-yellow to tan-colored, usually darker 

 in outer layers when old, bitter to the taste and often resinous 

 near the base, somewhat like Fames Laricis (Jacq.) Murrill, 4-8 

 cm. thick; tubes not stratified, brown within, cylindric, 0.5-3 cm - 

 in length, shorter next to the margin, mouths circular or slightly 

 irregular, 13 to a mm., yellow or yellow-green during growth, 

 turning brown when bruised or old, becoming lacerate; spores 

 hyaline or slightly tinged with brown, smooth, ovoid, 5-8 X 

 3-4 n, nucleated ; cystidia none. 



Common throughout California and Oregon, causing the serious 

 "pin-rot" or "peckiness" of the incense cedar, Libocedrus de- 

 cur r ens. The hymenophores are not very often seen, but the 

 rot is common, often affecting as high as 100 per cent, of the in- 

 cense cedar trees of a given area. 



21. PYROPOLYPORUS Murrill 



Hymenophore large, perennial, epixylous, sessile, ungulate or 

 applanate; surface sulcate, usually anoderm and often rough or 

 rimose; context woody or punky, brown; tubes brown, cylindric, 

 stratose, usually thick- walled ; spores smooth, hyaline. 



Margin of pileus at first ferruginous; context fulvous, opaque, i. P. igniarius. 

 Margin of pileus at first melleous; context isabelline, lustrous. 2. P. Abramsianus. 



i. PYROPOLYPORUS IGNIARIUS (L.) Murrill 



Pileus woody, ungulate, sessile, 6-7 X 8-10 X 5-12 cm.; 

 surface smooth, encrusted, opaque, velvety to glabrous, fer- 

 ruginous to fuscous, becoming black and rimose with age; 

 margin obtuse, sterile, ferruginous to hoary, tomentose; context 

 woody, distinctly zonate, ferruginous to fulvous, 2-3 cm. thick; 

 tubes evenly stratified, 2-4 mm. long each season, fulvous, 

 whitish-stuffed in age, mouths circular, minute, 3-4 to a mm., 

 edges obtuse, ferruginous to fulvous, hoary when young; spores 

 globose, smooth, hyaline, 6-7 /r, cystidia 1025 X 5-6 /*. 



Found on living willow trunks near Tacoma, Washington, and 

 Eugene, Oregon; also on Ceanoihus at Grass Valley, California. 

 It causes a very serious heart-rot. 



2. PYROPOLYPORUS ABRAMSIANUS Murrill, sp. nov. 



Pileus woody, ungulate or triquetrous, broadly attached, sub- 

 imbricate, 3-4 X 6-8 X 4-6 cm.; surface finely tomentose to 

 glabrous, smooth, melleous, becoming gray or fuliginous, not 



