14 WESTERN POLYPORES 



ate-dentate; spores oblong, slightly curved, uniguttulate, smooth, 

 hyaline, 5-5.5 X 2-3. 5/1; stipe lateral, woody, white, marked 

 with the decurrent tubes, very short and expanding into the 

 pileus, 1-2 cm. long, 5-10 mm. thick. 



Type collected on dead wood at Seattle, Washington, during 

 the winter and spring of 1911-12, S. M. Zeller 146 (herb. N. Y. 

 Bot. Card.). This species resembles Polyporus varius of Europe, 

 but it is heavier, has no striations on the surface, and the tubes 

 are more delicate and lacerate. 



6. POLYPORUS ELEGANS (Bull.) Fries 



Pileus flabelliform to subcircular, scarcely depressed behind, 

 convex or nearly plane, 2-6 X 3-10 X 0.2-1 cm.; surface dis- 

 tinctly radiate-striate, pruinose when young, becoming glabrous 

 and pale-ochraceous at maturity; margin thin, at first inflexed, 

 often becoming wavy or much lobed and folded with age, not 

 ciliate; context white or pallid, corky, 1-5 mm. thick; tubes pale- 

 avellaneous, 1-3 mm. long, cylindric, mouths angular to sub- 

 circular, entire, at first white, glistening, pale-umbrinous with 

 age,4~5 to a mm., edges thin, entire ; spores oblong, 7-8 X 3~3-5 M; 

 stipe eccentric or lateral, rarely central, woody, smooth, pallid 

 above, abruptly black and scutate below, 1-4 cm. long, 2-5 mm. 

 thick. 



Common in Oregon and Washington on fallen dead branches of 

 alder and other deciduous trees. Less common southward. 



7. POLYPORUS FISSUS Berk. 



Pileus flabelliform to subcircular, often depressed at the disk 

 or behind, convex, very variable in size, 5-15 X 7-20 X 0.3-1 

 cm.; surface glabrous, minutely radiate-striate, bay or fuliginous, 

 rugose on the disk; margin thin, fertile, wavy or lobed, often 

 splitting with age; context corky, pallid, 2-8 mm. thick; tubes 

 white to yellowish-brown, decurrent, 2 mm. long, cylindric, 

 slender, mouths subcircular, very minute, 6-7 to a mm., edges 

 thin, entire, becoming elongate with age; stipe eccentric, varying 

 to central or lateral, usually tapering above, fuliginous to nearly 

 black, pruinose, rugose, 2-6 cm. long, 0.5-2 cm. thick. 



Found at Corvallis and Marshfield, Oregon, and also in Wash- 

 ington. Reported from Washington as common on poplar and 

 rare on fir and spruce. 



