32 TROPICAL POLYPORES 



subcircular, inconspicuous, even, regular, 10 to a mm., edges 

 thin, entire; spores ovoid. 



Frequent to common on dead wood in Mexico, Cuba, and 

 Porto Rico. 



5. RIGIDOPORUS CONTRARIUS (Cooke) Murrill 



Pileus attached by the vertex, subcircular to dimidiate, 

 applanate, fleshy-corky, 3-6 X 5-1 1 X 0.3-0.5 cm. ; surface ochra- 

 ceous, soon becoming brown, zonate, tomentose, at length 

 glabrous, slightly concentrically sulcate; margin thin, entire or 

 undulate, sterile, ochraceous, easily bruised; context thin, 

 fibrous-corky, pallid, 1-3 mm. thick; tubes pallid, 2-4 mm. long, 

 mouths circular, regular, white to discolored, 5 to a mm., edges 

 very obtuse, entire, glistening. 



Found a few times on dead trunks in Cuba. 



6. RIGIDOPORUS SURINAMENSIS (Miq.) Murrill 



Pileus imbricate-multiplex, laterally connate, dimidiate or 

 reniform, fleshy-corky, convex or applanate, 2-3 X 2.5-5 X 0.3- 

 O.6 cm.; surface smooth or rugulose, pruinose to glabrous, 

 isabelline to latericeous; margin acute, thin, inflexed, entire or 

 undulate, often obtuse with age; context very thin, white, 

 fibrous, 1-2 mm. thick; tubes white, 2-4 mm. long, slender, 

 mouths minute, circular to angular, regular, even, 6 to a mm., 

 edges thin, entire, white to pallid, becoming discolored with 

 age; spores globose, 3-4.5 n. 



Common throughout on water-soaked hardwood trunks. 



12. PORODISCULUS Murrill 



Hymenophore small, annual, tough, epixylous, erumpent from 

 the lenticels of dead branches; stipe attached to the vertex of 

 the pileus, usually curved at maturity; context white, fibrous; 

 tubes cylindric, short, one-layered, mouths constricted; spores 

 globose, smooth, hyaline. 



i. PORODISCULUS PENDULUS (Schw.) Murrill 



Pileus very small, turbinate-cup-shaped, attached at the 

 vertex, soon decurved and pendant, gregarious, erumpent from 

 the lenticels of dead branches, 1-2 mm. broad, 3-5 mm. long; 

 surface anoderm, azonate, smooth, umbrinous, uniformly covered 

 with a brown powder, often ashy- white with age ; margin inflexed, 

 concolorous, sterile ; context white, fibrous, very thin ; tubes very 



