TROPICAL POLYPORES 13 



1 8. CORIOLUS LEIODERMUS (Mont.) Murrill 



Pileus thin, tough, leathery, flexible, dimidiate, often decurrent, 

 conchate, 3-4 X 4-6 X 0.1-0.3 cm.; surface multizonate, slightly 

 silky, becoming glabrous, minutely furrowed radiately, isabelline- 

 fulvous; margin thin, entire, pallid; context white to pallid, 

 punky-fibrous, 0.5-1.5 mm. thick; tubes 1-1.5 mm. long, pallid 

 within, mouths circular to angular, very regular, variable in 

 size, 3-6 to a mm., edges thin, firm, entire to dentate, pallid to 

 umbrinous-f ulvous, glistening ; spores globose, 3-4 /i. 



Occasional on dead wood in Nicaragua and Guiana. 



19. CORIOLUS MEMBRANACEUS (Sw.) Pat. 



Pileus very thin, densely imbricate, dimidiate or flabelliform, 

 conchate, 2-4 X 3-6 X 0.1-0.2 cm.; surface multizonate, finely 

 radiate-furrowed, short-tomentose to glabrous and subshining, 

 white or pallid with slightly darker zones; margin very thin, 

 undulate or lobed, usually splitting with age; context white, 

 fibrous, 0.5-1.5 mm. thick; tubes very short, less than I mm., 

 white to discolored within, mouths angular, 4-6 to a mm., 

 edges very thin, denticulate, fimbriate with age, white to isa- 

 belline or nearly fulvous in dried specimens; spores globose, 4-5 ju. 



Extremely common throughout on various forms of dead wood. 



20. 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 ** 



Common throughout on various forms of dead wood. 



21. CORIOLUS FULVO-UMBRINUS Murrill 



Pileus laterally connate, semicampanulate, umbonate-attached, 

 thin, slightly flexible, 2 X 2-3 X o.i cm., broader by confluence; 

 surface strigose-tomentose, multizonate, somewhat radiate- 

 rugose, uneven, latericeous-fulvous, the zones very slightly 

 darker; margin and new growth white to avellaneous, hirsute, 

 zonate, slightly lobed, sometimes proliferous; context thin, mem- 



2 



