WESTERN POLYPORES 7 



scattered promiscuously or arranged in zones; margin thin, white 

 to discolored, undulate or lobed; context white, cheesy to fragile, 

 3-8 mm. thick; tubes white, 3-6 mm. long, mouths small, 

 angular, glistening, 4-5 to a mm., white to avellaneous or um- 

 brinous, often sordid-spotted in dried specimens, edges thin, 

 fragile, lacerate; spores globose, 5 p. 



Rare on coniferous stumps and logs in Washington and Oregon. 

 Its taste somewhat resembles that of Fomes Laricis, but is milder. 

 Compare Polyporus alutaceus Fries. 



2. TYROMYCES CAESIUS (Schrad.) Murrill 



Pileus dimidiate, imbricate, often narrowly attached, with a 

 prominent umbo, variable in habit and size, soft, spongy when 

 fresh, fragile when dry, 1-2 X 3-6 X 0.5-1.5 cm.; surface sod- 

 den, tomentose or villose-tomentose, azonate, murinous or 

 griseous when fresh, becoming caesious or fading to nearly pure- 

 white on drying, often nearly glabrous with age; context white, 

 soft, friable, 5-8 mm. thick; tubes long and slender, 5-10 mm. 

 long, caesious within, collapsing, friable, mouths angular, 3-4 

 to a mm., edges white or bluish-gray, very thin, dentate to long 

 and sharply lacerate; spores elongate, 5-5.5 X 1.5 M- 



Occasional in Washington and Oregon on dead coniferous wood. 

 It occurs also on deciduous wood. 



3. TYROMYCES SEMIPILEATUS (Peck) Murrill 



Pileus effused, largely resupinate, suborbicular or laterally 

 elongate, very narrowly reflexed, the reflexed portion o-i X 2-5 

 X 0.3-0.5 cm.; surface white or pale-isabelline, subvillose or 

 scabrous, azonate; margin thin, undulate, sometimes inflexed; 

 context white, fleshy-tough to fragile, 2-4 mm. thick; tubes 

 short, slender, white to yellowish within, mouths minute, circular 

 to slightly angular, scarcely conspicuous, 7 to a mm., edges 

 thin, very even, entire, white to pallid, often bluish-discolored 

 in spots or blotches; spores subglobose, 6-8 ju. 



Common on logs and dead branches of alder and maple in 

 Washington, Oregon, and California. 



4. TYROMYCES CUTIFRACTUS Murrill 



Pileus usually broadly attached and laterally elongate, rarely 

 flabelliform, slightly imbricate at times, 2-3.5X4-6X0.5-0.8 cm.; 

 surface glabrous, white, often rough and unsightly because of 

 the cracked and torn reddish-brown cuticle; context rather thick, 



