WESTERN POLYPORES 17 



10. PYCNOPORELLUS Murrill 



Hymenophore annual, epixylous, sessile, dimidiate, simple or 

 imbricate, reddish or orange-colored throughout; surface ano- 

 derm, margin thin; context thin, friable; tubes thin-walled, 

 fragile, at length lacerate; spores smooth, hyaline or pale- 

 yellowish. 



i. PYCNOPORELLUS FIBRILLOSUS (P. Karst.) Murrill 



Pileus soft, spongy, fragile when dry, thin, dimidiate, imbri- 

 cate, 3-5 X 6-8 X 0.5-1 cm.; surface anoderm, orange-colored, 

 nbrillose-tomentose, zonate, at times uneven and sodden in 

 appearance; margin thin, subentire, tomentose, paler; context 

 obscurely zoned, orange-colored, friable when dry, spongy and 

 absorbing water when fresh, 3-5 mm. thick; tubes annual, 3-5 

 mm. long, pallid to orange-colored, mouths angular, irregular, 

 1-2 to a mm., edges very thin, pallid and entire when young, at 

 length orange-colored and very lacerate; spores smooth, oblong, 

 hyaline or pale-yellowish, 6-7 X 3-4 //. 



Occasional on Psendotsuga, Tsuga, and Abies in Washington, 

 especially in the mountains. Reported from Idaho on maple. 



ii. PYCNOPORUS P. Karst. 



Hymenophore annual, sometimes reviving, epixylous, sessile, 

 dimidiate, simple or imbricate, rarely pseudo-stipitate ; surface 

 anoderm, slightly pelliculose at times, zonate or azonate, bright- 

 er dull-red; context red, soft-corky to punky; hymenium con- 

 colorous, tubes small, firm, thin-walled; spores smooth, 

 hyaline. 



i. PYCNOPORUS CINNABARINUS (Jacq.) P. Karst. 



Pileus convex-plane, dimidiate, laterally extended, reviving 

 the second season, 4-6 X 5-10 X 0.5-1 cm.; surface azonate, 

 rugulose, pruinose to tomentose, at length glabrous, the color 

 changing from light-orange to cinnabar-red, often fading with 

 age; margin acute, except in large plants, faintly zonate; context 

 floccose, elastic, zonate, reddish; tubes nearly equaling the 

 context, firm, miniatous within, the mouths small, 2-3 to a mm., 

 regular, coccineous, dissepiments rather thin, entire; spores 

 6-8 X 2-3 n. 



Reported by Harkness as occurring on oak in California. 



12. LAETIPORUS Murrill 



Hymenophore annual, epixylous, fleshy, anoderm, cespitose- 

 multiplex; context cheesy to fragile, light-colored; tubes thin- 



