6 WESTERN POLYPORES 



i. SPONGIPORUS LEUCOSPONGIA (Cooke & Hark.) Murrill 



Pileus rather small, dimidiate, conchate, pulverulent, 2-3 X 

 6-10X1.5-2.5 cm.; surface white, anoderm, very soft and spongy, 

 finely tomentose to glabrous; margin rounded, inflexed, sterile, 

 concolorous; context white, extremely soft and spongy, slightly 

 firmer next to the tubes with age, 5-20 mm. thick; tubes large, 

 irregular, 2-4 mm. long, white to discolored and slightly resinous 

 in appearance, mouths angular, irregular, about 2 to a mm., 

 edges thin, entire to lacerate-dentate; spores ellipsoid, 7 X 5 /* 



Occasional on dead coniferous logs in California, usually at 

 high altitudes. 



4. TYROMYCES P. Karst. 



Hymenophore annual, epixylous, sessile, anoderm, azonate, 

 glabrous or nearly so; context white, fibrous, fleshy to fleshy- 

 tough, rigid and friable when dry; tubes thin-walled, white or 

 yellowish, mouths polygonal; spores smooth, hyaline. 



Pileus 10-15 cm. broad. i. T. guttulatus. 



Pileus 1-6 cm. broad. 



Surface villose or tomentose. 



Pileus more or less bluish, not effused. 2. T. caesius. 



Pileus not bluish, effused-reflexed. 3. T. semipileatus. 



Surface glabrous or nearly so. 



Surface becoming rough from the cracking of the 



reddish-brown cuticle. 4. T. cutifraclus. 



Surface not becoming rough as above. 



Surface grayish-cinereous or yellowish- white; tubes 



white or yellowish. 5. T. chioneus. 



Surface white or hygrophanous, the margin and 



hymenium pale-rose-tinted. 6. T. carbonarius. 



Surface and hymenium milk-white, rarely be- 

 coming slightly yellowish on drying, 



Pileus 1-2 cm. broad, very thin, entirely sessile. 7. T. perdelicatus. 

 Pileus 2-4 cm. broad. 



Pileus imbricate-sessile, 3-10 mm. thick. 8. T. Pseudotsugae. 



Pileus substipitate, irregular, 2-3 mm. thick. 9. T. substipitatus. 



i. TYROMYCES GUTTULATUS (Peck) Murrill 



Pileus cespitose or gregarious, broad, applanate, sessile or 

 attached by an attenuate base, cheesy-soft when fresh, rigid and 

 fragile when dry, 5-7 X 10-15 X 0.5-1.5 cm.; surface white or 

 yellowish-white, becoming sordid with age, especially at the 

 margin, glabrous, somewhat uneven, slightly zonate at times, 

 marked with numerous rounded, depressed, watery spots, either 



