12 SOUTHERN POLYPORES 



5. 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 large. 8 cm. or more in diameter. 



Tubes less than 5 mm. long. i. T. palustris. 



Tubes more than 5 mm. long. 

 Surface of pileus very smooth. 



Pileus white or slightly yellowish, unchanging; tubes 



small, entire. 2. T. Calkinsii. 



Pileus becoming dark-sordid-bay throughout on 



drying; tubes 3 to a mm., lacerate. 3. T. Smallii. 



Surface of pileus sodden, rough. 4. T. Spraguei. 



Pileus small to medium, rarely exceeding 5 cm. in diameter. 

 Pileus resinous or cartilaginous in appearance; tubes 



lacerate. 5. T. cerifluus. 



Pileus neither resinous nor cartilaginous. 



Surface conspicuously villose or tomentose. 



Pileus more or less bluish, not effused. 6. T. caesius. 



Pileus not bluish, effused-reflexed. 7. T. semipilealus. 



Surface glabrous or nearly so. 



Surface pelliculose, more or less tinged with gray. 8. T. chioneus. 

 Surface white, without a pellicle. 9. T. lacleus. 



I. TYROMYCES PALUSTRIS (Berk. & Curt.) Murrill 



Pileus dimidiate, convex above, plane or concave below, 

 much thicker behind, subimbricate, fleshy-tough to rigid and 

 somewhat friable when dry, 4-6 X 8-10 X 1-3 cm.; surface 

 smooth, glabrous, white to slightly yellowish, sometimes rough 

 and tubercular behind; margin thin or thick, entire or undulate, 

 white, becoming slightly discolored; context 1-2 cm. thick, 

 white, fleshy-fibrous when fresh, becoming firm and somewhat 

 friable when dry; tubes 2-5 mm. long, white to slightly yellowish 

 within, about 4 to a mm., edges thin, white to yellowish, entire 

 to dentate. 



Occasional on pine trunks in Georgia, South Carolina, and 



Florida. 



2. TYROMYCES CALKINSII Murrill 



Pileus somewhat imbricate, dimidiate, convex above, concave 

 below, cheesy when fresh, rigid when dry, 3-5 X 6-8 X i-5~2 

 cm.; surface smooth, glabrous, azonate, white to cremeous or 

 ochraceous-fulvous; margin thin or thick, entire or undulate, 

 easily bruised, fertile; context white, fleshy to somewhat friable, 



