TROPICAL POLYPORES 39 



18. HEXAGONA INDURATA (Berk.) Murrill 



Pileus reniform, slightly convex, attached by the vertex, 

 2.5 X 3 X 0.2-0.3 cm.; surface liver-colored, glabrous, usually 

 tessellate; margin rather thick, entire; context fleshy-tough, 

 white, opaque; tubes lighter than the pileus, subhexagonal, 

 1-1.5 mm. long, mouths I mm. or less in diameter, edges entire 

 to toothed; spores ellipsoid. 



Found once on dead wood in Santo Domingo. 



19. HEXAGONA BRUNNEOLA (Berk. & Curt.) Murrill 



Pileus flabelliform, wedge-shaped behind, 2.5 X 2.5 X 0.1-0.2 

 cm.; surface brown, glabrous, rugulose when dry; margin thin, 

 undulate or lobed; context membranous, white, opaque; tubes 

 discolored, very short, much less than a mm., subhexagonal, 

 mouths i mm. in diameter, edges entire; spores ellipsoid; stipe 

 spurious or a mere lateral disk. 



Found once on dead wood in Cuba. 



20. HEXAGONA CUCULLATA (Mont.) Murrill 



Pileus reniform, convex, umbonate-sessile, 3-6 X 6-8 X 0.2 

 cm.; surface glabrous, often radiate-striate, cream-colored to 

 ochraceous, plane or marked with two or three broad undu- 

 lations from center to margin, which is thin, entire, irregularly 

 undulate or lobed and deflexed when dry; context fleshy-tough, 

 white, 0.5 mm. thick; tubes ochraceous to dark-fulvous, hexag- 

 onal, not radially elongate, very variable in size, 1.5-3.5 mm. 

 long, 1-3 mm. wide, edges thin, finely denticulate; spores ellip- 

 soid, 14 X 7 Ml stipe a mere scutate disk nearly a centimeter in 

 breadth. 



Frequent on dead wood throughout most of the region. 



14, MICROPORELLUS Murrill 



Hymenophore thin, annual, epixylous, usually flabelliform, 

 stipitate, the stipe variously attached and sometimes much 

 reduced; surface anoderm, multizonate; context thin, white, 

 fibrous, rigid and fragile when dry; tubes very minute, regular, 

 thin- walled, fragile when dry; spores smooth, hyaline. 



Pileus white or pale-brown, unchanging. 



Tubes entire. i. M. dealbatus. 



Tubes lacerate. 2. M. unguicularis. 

 Pileus ochraceous or sordid, becoming bay or black with age 

 or on drying. 



Pileus ochraceous, becoming bay. 3. M . porphyritis. 



Pileus sordid, becoming black. 4. M. holotephrus. 



