1 8 TROPICAL POLYPORES 



mm., edges thin, undulate to dentate, white; spores oblong, 

 12 X 5 /* 



Frequent on structural timber and other dead wood in the 

 mountains of Cuba, Jamaica, Montserrat, Mexico, and Costa 

 Rica. An isabelline, rather irregular form, varying to entirely 

 resupinate, is often difficult to associate with the typical form of 

 this species. 



4. SPONGIPORUS Murrill 

 Hymenophore small, annual, epixylous, sessile, dimidiate, pul- 



vinate; surface white, anoderm to subpelliculose, azonate, soft 

 and elastic ; context white, extremely soft and spongy throughout ; 

 hymenium rigid, somewhat discolored; tubes large, irregular, 

 thin-walled, lacerate; spores smooth, hyaline. 



i. SPONGIPORUS ALTOCEDRONENSIS Murrill 



Pileus very soft and spongy, broadly attached, decurrent, 

 subimbricate, 0.5-1 X 1.5-3 X 0.5-1 cm. ; surface white, azonate, 

 smooth, villose; margin thick, broadly sterile; context white, 

 very soft and spongy, radiate-fibrous, a few fibers being darker 

 and firmer, 3-8 mm. thick; tubes shallow, ample, white to pale- 

 reddish-brown, about I mm. in length, 1-2 to a mm., mouths 

 quite irregular, angular, edges thin, uneven, dentate; spores 

 globose, 4-4.5 /i. 



Collected once on rotten wood at Alto Cedro, Cuba. 



5. TOMOPHAGUS Murrill 



Hymenophore very large, but of light weight, annual, epixy- 

 lous, sessile, dimidiate, thick and pulvinate; surface pelliculose, 

 glabrous, azonate, margin very obtuse; context very thick, soft 

 and spongy throughout; tubes small, dark-colored, thin-walled, 

 fragile; spores smooth, hyaline. 



i. TOMOPHAGUS COLOSSUS (Fries) Murrill 



Pileus of immense size but of very light weight, dimidiate to 

 reniform, sessile, convex above, 10-20 X 15-30 X 7-10 cm.; 

 surface azonate, glabrous, smooth, pale-yellowish, at length 

 covered with a very thin cuticle, which becomes cracked, 

 wrinkled, and pallid with age; margin very obtuse, rounded, con- 

 colorous; context very soft and spongy, homogeneous, concen- 

 trically zonate, several centimeters thick; tubes minute, soft, 

 white to discolored within, 2-5 mm. long, mouths angular, 3-4 



