4 WESTERN POLYPORES 



Common throughout on various forms of dead deciduous wood 

 and rarely on coniferous wood. It causes a serious root-rot in 

 many trees. 



2. CORIOLUS NIGROMARGINATUS (Schw.) Murrill 



Pileus confluent-effused, more or less imbricate, dimidiate, 

 applanate, corky-leathery, rather thick, flexible or rigid, 3-5 

 X 5-8 X 0.3-0.8 cm.; surface conspicuously hirsute, isabelline 

 to cinereous, concentrically furrowed and zoned; margin at 

 length thin, often fuliginous, sterile, finely strigose-tomentose, 

 entire or undulate; context white, thin, fibrous, spongy above, 

 1-4 mm. thick; tubes white, 1-2 mm. long, mouths circular to 

 angular, 4 to a mm., quite regular, edges thin, firm, tough, entire, 

 white to yellowish or umbrinous; spores cylindric, slightly 

 curved, 2.5-3 M- 



Common throughout on dead deciduous wood, and found at 

 times on coniferous wood. 



3. CORIOLUS ABIETINUS (Dicks.) Quel. 



Pileus effused-reflexed, the reflexed portion thin, tough, flexible 

 to nearly rigid, 0.5-1.5 X 1-3 X 0.05-0.1 cm.; surface obsoletely 

 zonate, grayish-white, villose; margin thin, undulate to lobed, 

 fimbriate with age, incurved on drying; context very thin, white, 

 membranous; tubes uneven, irregular, soon becoming irpiciform, 

 mouths variable in size, 2-3 to a mm., edges thin, lacerate- 

 dentate, unequal, pallid or violet, fading with age, somewhat 

 flesh-tinted in dried specimens; spores globose, 4.5-5.5 n- 



Common throughout on decaying coniferous trunks. This 

 species also occurs in Japan and the Philippine Islands. 



4. CORIOLUS WASHINGTONENSIS Murrill 



Pileus small, dimidiate, laterally connate, slightly decurrent 

 behind, sometimes effused, tough, flexible, milk-white throughout, 

 becoming slightly yellowish above on drying, and grayish behind 

 with age, projecting about 5 mm. from the substratum, extending 

 sometimes 10 cm. along cracks in the bark, reaching 5 mm. in 

 thickness behind; surface azonate, smooth, subglabrous, margin 

 undulate or lobed, sterile, rather thick for the genus; context 

 thin, soft, flexible; tubes 1-4 mm. long, corky, mouths regular, 

 glistening, slightly angular, 2 to a mm., edges thin, entire; spores 

 ovoid, 5 X 3-5 /* 



Found once at Seattle, Washington, growing from crevices in 

 the bark of a dead log of Thuya plicata. 



