68 NATURAL HISTORY BULLETIN. 



horizontal membrane, and these becoming confluent form the 

 hymenium. Possibly this should be considered a mere var. 

 of 7 1 . pedicel /at a Schvv. 



On small live twigs. Collected at Castillo, Nicaragua, 1893. 



4. Hexagonia vittata Ellis & Macbride. 



Pileus membranaceo-coriaceous. expanded, 2-3 cm. wide, 

 6-10 cm. long, subresupinate, the margin free and more or 

 less reflexed, somewhat sulcate-plicate, thin, undulate, acute 

 above, concentrically vittate, almost glabrous, black, the 

 edge paler and sterile for only a very short distance; the al- 

 veoli pallid brown or fuscous, sometimes when young bluish 

 or ashen, lustrous, the walls rigid, acute, the margins entire 

 500-700,0 in diameter, somewhat irregular or elongate. 



On the lower surface of fallen stems and branches of de- 

 ciduous trees, Castillo, Nicaragua. C. L. Smith, 1S93. 



Judging by description of the compared species, H. vittata 

 would seem near H. carbonaria B. & C. but differs in its free 

 margin. From H.friesiana Speg. the present species seems 

 to differ in being never dimidiate 'and in the peculiar, vittate, 

 upturned margin. A very beautiful species. Like a Poria; 

 but its dry rigid dissepiments, large and comparatively regu- 

 lar alveoli would seem to justify reference rather to the genus 

 Hexagonia. 



5. Polyporus obolus Ellis & Macbride. 



Pileus fleshy, soft, white or pallid, glabrous, thin delicate, 

 wrinkled, and with repand margin when dry; above plane or 

 only slightly convex, in diam. 2 cm. or less; stipe cartilagin- 

 ous, delicate, slender, even or slightly enlarged at base, brown, 

 translucent, 1-3 cm. in length, 2-3 mm. in thickness; pores 

 minute, scarcely visible to the naked eye, round, not decur- 

 rent, white, the dissepiments thick and obtuse. 



An extremely delicate and beautiful little species, distin- 

 guished by its delicate waxen non-umbilicate pileus, as by its 

 graceful, slender, corneous stipe. Most of the specimens are 

 very small, about 1 cm. in diameter, the stipe about the same 

 ength. 



