TROPICAL POLYPORES 



33 



short, annual, white within, mouths circular, constricted, white, 

 pruinose, becoming concolorous, 6-7 to a mm., edges entire; 

 spores globose, 4 n; stipe 2 mm. or less in length, vertically 

 attached, gradually expanding into the pileus, which it resembles 

 in surface and context. 

 Found in Nicaragua. 



13. HEXAGONA Pollini 



Hymenophore small, annual, epixylous, flabelliform to reni- 

 form, rarely circular, stipitate, the stipe sometimes much reduced; 

 surface smooth or tessellate, margin thin; context thin, white, 

 fibrous, fleshy to tough, usually fragile when dry; hymenium of 

 radiating rows of large, thin-walled, hexagonal tubes, usually 

 radially elongate; spores smooth, hyaline. 



Tubes unequally hexagonal, the radial walls longer. 

 Pileus white or nearly so. 



Surface of pileus not distinctly tomentose. 

 Stipe 5-10 mm. in diameter. 



Tubes I mm. in length. I. H. princeps. 



Tubes 3-6 mm. in length. 2. H. pseudoprincefs. 



Stipe 1-3 mm. in diameter. 



Pileus less than 3 cm. broad. 



Tubes flesh-colored, 2 mm. wide. 3. H. Maxoni. 



Tubes pallid, i mm. wide. 4- H. floridana. 



Pileus more than 3 cm. broad. 

 Margin entire, often pellucid. 



Tubes 1-2.5 m m. wide. 5. H. daeddlea. 



Tubes much smaller, only 0.5 mm. 



wide. 6. H. daedaleiformis. 



Margin ciliate or denticulate. 



Surface minutely checkered. 7. H. tessellalula. 



Surface not checkered. 8. H. fragilis. 



Surface of pileus distinctly tomentose. 



Context thin, translucent. 9- H . reniformis. 



Context thick, opaque. 



Surface tessellate; stipe distinct. 10. H. subcaperata. 



Surf ace not tessellate; stipe a mere tubercle, n. H.caperata. 

 Pileus sulfur-colored throughout. 12. H. sulfur ea. 



Pileus pale-avellaneous-isabelline, becoming bay on 



drying. 13. H. motzorongensis. 



Pileus purple or brown. 



Pileus purple or purplish-brown; stipe lateral or 



eccentric. 

 Pileus subcircular; stipe eccentric; tubes 2.5 



mm. long. 14. H. subpurpurascens. 



Pileus spatulate; stipe lateral; tubes 1.5 mm. 



long. 15. H. purpurascens. 



