TROPICAL POLYPORES 77 



to a mm., edges obtuse, white or slightly avellaneous; spores 

 subglobose or ovoid, smooth, hyaline, 7 X 6 p. 



Occasional on dead wood throughout most of tropical America. 



8. FOMES UNGULATUS (Schaeff.) Sacc. 



Pileus corky to woody, ungulate, 8-15 X 12-40 X 6-10 cm.; 

 surface glabrous, sulcate, reddish-brown to gray or black, often 

 resinous; margin at first acute to tumid, pallid, becoming yellow- 

 ish or reddish-chestnut; context woody, pallid, 0.5-1 cm. thick; 

 tubes distinctly stratified, 3-5 .mm. long each season, white to 

 isabelline, mouths circular, 3-5 to a mm., edges obtuse, white to 

 cream-colored; spores ovoid, smooth, 6 /z. 



Reported once by Wright on pine trunks in Cuba. 



9. FOMES RUBRITINCTUS Murrill 



A large perennial plant of many layers, the upper partly dead 

 and discolored, the lower smooth, light-colored, and anoderm, 

 with large pores, which become dark-red when bruised; pileus 

 corky to woody, dimidiate, convex, 4-12 X 5-15 X 3-10 cm.; 

 surface anoderm, smooth, velvety to the touch, white or pallid, 

 becoming dark-brown and roughened with age; margin obtuse, 

 sterile, concolorous; context corky, becoming woody, pallid, 

 1.5 cm. thick; tubes unevenly stratified, the layers separated by 

 unusually thick cushions of context, 0.5-1 cm. long each season, 

 2 to a mm., isabelline within, becoming umbrinous in the older 

 layers, mouths subcircular or polygonal, edges thin, isabelline, 

 becoming dark-red when bruised; spores globose to ovoid, 5-7 /x 

 long, the wall of medium thickness. 



Collected once on dead trunks in Nicaragua. 



10. FOMES AUBERIANUS (Mont.) Murrill 



Pileus woody, conchate to pulverulent, 4-10 X 7-15 X 1-2 

 cm.; surface glabrous, rugose, radiate-striate, zonate, isabelline 

 to light-fulvous; margin thin but usually obtuse, pallid, turning 

 bay when bruised, ungulate to lobed, deflexed; context corky to 

 woody, almost white, 0.5-1.5 cm. thick; tubes distinctly stratose, 

 3-7 mm. long each season, fulvous within, mouths circular to 

 angular, minute, 6-7 to a mm., edges thin, entire, light-bay, 

 darker when bruised, subglistening; spores globose, 3 ju. 



Common throughout on dead or wounded hardwood trunks. 



