46 TROPICAL POLYPORES 



marginal folds, not noticeably decurrent, yellowish, polygonal to 

 lamelloid, edges firm, entire, becoming denticulate or fimbriate 

 with age; spores ellipsoid, 7X4;*; stipe central, hollow, increas- 

 ing above, lighter than the pileus, subglabrous, with silky luster, 

 2 cm. long, 2-6 mm. thick, the buried base enlarged, tomentose, 

 and frequently black. 



Found once on buried sticks in Porto Rico. 



12. POLYPORUS TRICHOLOMA Mont. 



Pileus circular, convex to infundibuliform, usually cespitose, 

 1.5-4 X 0.05-0.2 cm.; surface white or pallid to ochraceous or 

 reddish-brown, azonate, fibrillose to glabrous; margin straight 

 or inflexed, conspicuously ornamented with rigid hairs, or cilia, 

 2 mm. long and of uncertain duration; context pallid, membra- 

 nous, tough; tubes slightly decurrent, white to pallid, 0.5-1 mm. 

 long, mouths angular, 5 to a mm., edges thin, dentate, elongate; 

 spores ellipsoid, 6-7 X 2-2.5/1; stipe central, equal, glabrous, 

 concolorous, very slender, 1.5-2.5 cm. long, 1-1.5 mm. thick. 



Very common throughout on dead sticks and logs in woods. 



13. POLYPORUS COWELLII Murrill 



Pileus orbicular, convex to plane, umbilicate, 1-2 X 0.02-0.05 

 cm.; surface nearly glabrous, minutely concentrically rugose, 

 straw-colored to isabelline, becoming darker and hygrophanous 

 around the margin or in blotches or even over the entire surface, 

 often faintly radiate-striate about the center with delicate white 

 or brown lines; margin very thin, straight or inflexed, somewhat 

 irregular in outline, finely denticulate, the teeth prolonged into 

 short, fugacious cilia; context extremely thin, membranous, 

 0.1-0.2 mm. thick, white or pallid, partially or entirely trans- 

 lucent; tubes 0.2-0.4 mm. long, 3-6 to a mm., larger by con- 

 fluence, adnate, pallid, polygonal, edges very thin, subentire, 

 becoming fimbriate with age; spores ellipsoid, 5 X 2.5/1; stipe 

 central, solid, very slender, equal, concolorous or slightly darker, 

 pruinose to glabrous, smooth, longitudinally striate, 2-3 cm. long, 

 0.3-1 mm. thick, soft and milk-white at the center. 



Found a few times on dead wood in Porto Rico and St. Kitts. 



14. POLYPORUS MACULOSUS Murrill 



Pileus irregularly orbicular, deeply depressed, 3-3.5 X 0.1-0.2 

 cm.; surface finely and densely tomentose, radiately striate, 

 drab-colored, ornamented with several light-bay or chestnut 

 spots mostly situated about midway between the center and the 



