56 TROPICAL POLYPORES 



villose-tomentose, grayish-isabelline or pale-fulvous; margin very 

 thin, pallid, broadly sterile, entire to slightly undulate; context 

 thin, membranous, isabelline, spongy, 1-2 mm. thick; tubes very 

 short and shallow, less than a mm. in length, mouths puncti- 

 form, regular, circular, 4-5 to a mm., edges thick, entire, white 

 to isabelline or pale-fulvous. 



Frequent throughout on dead hardwood logs. 



2. CORIOLOPSIS OCCIDENTALIS (Klotzsch) Murrill 



Pileus corky or leathery, dimidiate to reniform, applanate, 

 3-6 X 5-10 X 0.3-1 cm.; surface concentrically sulcate, zonate, 

 tomentose, grayish-ochraceous to grayish-isabelline, somewhat 

 fading with age; margin thin, velvety, entire; context ochro- 

 leucous, subshining, zonate, corky, 1-6 mm. thick; tubes rather 

 short, 2-4 mm. long, isabelline within, mouths circular, slightly 

 irregular at times, 2-4 to a mm., edges rather thick, becoming 

 thin, entire, firm, milk-white when young and fresh, isabelline 

 to ochraceous-fulvous at maturity; spores allantoid, 5-7 X 2-3 p. 



Extremely common on various kinds of dead wood throughout. 



3. CORIOLOPSIS RIGIDA (Berk. & Mont.) Murrill 



Pileus thin, coriaceous, flexible to rigid, effused-reflexed, 

 imbricate, laterally connate, the reflexed portion flabelliform, 

 applanate or conchate, 0.5-3 X 3-6 X 0.1-0.2 cm.; surface 

 spuriously zoned, sometimes zonate behind, concentrically fur- 

 rowed at times, hirsute to hispid, nearly white to isabelline; 

 margin very thin, pallid, undulate to lobed; context pallid to 

 isabelline, membranous; tubes very short, grayish-isabelline 

 within, mouths fairly regular, circular to slightly angular, 3-4 

 to a mm., edges white to grayish- white and finally isabelline, 

 rather thick at first, becoming thin, entire and slightly uneven. 



Common on dead wood throughout. 



4. CORIOLOPSIS FULVOCINEREA Murrill 



Pileus coriaceous, flexible to rigid, dimidiate, imbricate, 

 laterally connate, often decurrent, usually conchate, 2-4 X 3-8 

 X 0.2-0.4 cm.; surface spuriously zonate, concentrically striate 

 or sulcate, uneven, often plicate, isabelline to fulvous or cinereous, 

 tomentose, scabrous behind; margin very thin, undulate to 

 lobed, tomentose, isabelline to fulvous; context membranous, 

 fibrous, pale-umbrinous, becoming darker with age, about 1-2 

 mm. thick; tubes short, 1-2 mm. long, cinereous to avellaneous 

 within, mouths minute, regular, circular to angular, 3-4 to a 



