66 TROPICAL POLYPORES 



small, circular to somewhat angular, 3-4 to a mm., edges thick, 

 entire, pallid to umbrinous; spores oblong, 8-10 X 3-4 /*. 



Extremely common throughout on various forms of dead wood. 



30. NIGROPORUS Murrill 



Hymenium annual, epixylous, dimidiate-sessile to flabelliform, 

 glabrous; context dark-brown, firm, homogeneous; tubes short, 

 slender, thin-walled, black; spores smooth, hyaline. 



i. NIGROPORUS VINOSUS (Berk.) Murrill 



Pileus thin, dimidiate to reniform, imbricate, narrowly at- 

 tached by a scutate disk or laterally connate and broadly de- 

 current, 1-3 X 3-6 X 0.1-0.3 cm.; surface zonate, finely velvety 

 to glabrous, obscurely vinous-brown; margin yellowish when 

 young, thin, undulate, often inflexed on drying; context rigid, 

 tough, chestnut-colored, 1-2 mm. thick; tubes minute, short, 

 scarcely a mm. in length, smoky-black, mouths regular, angular, 

 7-9 to a mm., edges thin, entire, vinous-brown, pruinose when 

 young, blackish with age; spores allantoid, 3-4 X 1-1.5 M- 



Frequent on dead wood in Cuba, Santo Domingo, Guadeloupe, 

 Martinique, and British Honduras. 



31. CYCLOPORELLUS Murrill 



Hymenophore annual, tough, epixylous, sessile, anoderm, 

 zonate; context thin, fibrous, brown; tubes short, thin-walled, 

 mouths polygonal, becoming concentrically elongate in some 

 species by the splitting of the radial walls; spores ovoid, smooth, 

 pale-ferruginous. 



i. CYCLOPORELLUS IODINUS (Mont.) Murrill 



Pileus conchate, thin, umbonate-sessile, simple or imbricate, 

 often radially-plicate, 2-4 X 3-5 X 0.1-0.2 cm.; surface densely 

 concentrically zonate, velvety, tawny-chestnut; margin thin, 

 entire, ferruginous, deflexed in drying; context leathery, slightly 

 flexible, fulvous; hymenium fuliginous, tubes I mm. or less in 

 length, 3-7 to a mm., isabelline within, polygonal and regular, 

 often becoming concentrically confluent, edges thin, entire, 

 often splitting with age; spores pale-ferruginous, 5X3;*; 

 cystidia dark-brown, rather scanty, averaging 20 X 5 M- 



Frequent throughout on dead wood of frondose trees. 



