TROPICAL POLYPORES 47 



margin, which is very thin, striate, irregular and somewhat 

 fissured but entirely devoid of teeth or cilia; context 0.5-1.5 mm. 

 thick, tough to corky, pallid; tubes 0.2-0.4 mm. long, 6-7 to a 

 mm., decurrent, pallid or yellowish, subcylindric, edges entire; 

 spores ovoid, 4 X 3 n, immature in the type specimens; stipe 

 central, solid, woody, tapering upward, chestnut-black at the 

 base, with blotches of light-yellow, uneven, subglabrous, 2 cm. 

 long, 2-4 mm. thick. 



Found once on dead wood in Central America. 



15. POLYPORUS WRIGHTII Murrill 



Pileus circular, convex-plane, umbilicate, 3-4 X o.i cm.; 

 surface delicately radiate-striate, glabrous, yellowish-brown to 

 isabelline; margin thin, acute, bay, irregularly undulate or 

 lobed, slightly incurved, not ciliate; context membranous, pallid, 

 corky, less than 0.5 mm. thick; tubes decurrent, umbrinous 

 when dry, 0.5-1 mm. long, 2-3 to a mm., mouths irregular, 

 angular, very variable in size, edges thin, entire, slightly toothed 

 with age; stipe short, central, solid, woody, equal or slightly 

 enlarged at the base, pulverulent, black, 5-7 mm. long, 2-3 mm. 

 thick. 



Found once or twice on dead wood in Cuba. 



1 6. POLYPORUS MARASMIOIDES (Pat.) Murrill 



Pileus circular, convex-plane, deeply umbilicate, sometimes 

 entirely aborted, 1-5 X o.i cm.; surface glabrous, ochraceous, 

 obscurely striate near the margin, marked with a shallow, cir- 

 cular, peripheral furrow; margin straight, yellowish, translucent, 

 puberulent, denticulate, sterile; context pallid, corky; tubes 

 large, shallow, radiating, angular, I mm. or more in diameter, 

 edges thick, hard, entire, becoming denticulate or lacerate; spores 

 elongate-ovoid, guttulate, ioX4MJStipe central, cylindric, 

 brownish-black, white within, tenacious, woody, velvety-hispid, 

 1-15 cm. long. 



Found a few times on decaying seeds or dead trunks in Guade- 

 loupe and Martinique. 



17. POLYPORUS ELEGANS (Bull.) Fries 



Pileus flabelliform to subcircular, scarcely depressed behind, 

 convex or nearly plane, 2-6 X 3-10 X 0.2-1 cm.; surface dis- 

 tinctly radiate-striate, pruinose when young, becoming glabrous 

 and pale-ochraceous at maturity; margin thin, at first inflexed, 

 often becoming wavy or much lobed and folded with age, not 



