1918] 



BURT THELEPHORACEAE OF NORTH AMERICA. X 353 



sharp-pointed tips, confined to the hymenium ; spores hyaline, 

 even, 5x3 /x. 



Fructifications 1-3 cm. in diameter. 



On dead, erect trees. Cuba. February. Rare. 



In the original description, H. dura was said to be allied 

 to H. unicolor, but if so, it is in aspect only, for when seen in 

 section it is wholly different in structure from the latter, hav- 

 ing a narrow setigerous layer and a broad, intermediate layer 

 which is connected by a conspicuous dark zone with a well- 

 developed hyphal layer next to the substratum. This struc- 

 ture in section places H. dura in the group with H. tahacina, 

 from which, and from the other species of this group, it is 

 distinct by its hairy hymenium and small, scattered setae. 



Specimens examined: 

 Cuba: C. Wright, 241, type (in Kew Herb, and in Curtis 



Herb.). 



26. H. leonina Berk. & Curtis, Linn. Soc. Bot. Jour. 10 : 

 334. 1868; Cooke, Grevillea 8:148. 1880; Sacc. Syll. Fung. 

 6 : 597. 1888; Massee, Linn. Soc. Bot. Jour. 27 : 107. 1890. 



Type : in Kew Herb, and Curtis Herb. 



Fructifications resupinate, 

 widely effused, thick, coriaceous, 

 separable from substratum when 

 moist, not cracked, drying tawny 

 olive to Brussels-brown, the 

 margin tomentose; in structure ^ ifonina 



200-700 n thick, composed of (1) Section X 44. From type. 



a compact setigerous layer 50-75 



H thick, with the setae starting at different levels within it, 

 and of (2) a broad, supporting hyphal layer 100-600 /x 

 thick, composed of loosely interwoven, rather longitudinally 

 arranged hyphae 3 /x in diameter, stiff, colored like the 

 fructification; in fully developed, thick fructifications the 

 hyphal layer is divided parallel with the substratum by a nar- 

 row, dark zone; setae 60-80x7-9 /x, emerging up to 50 /x, 

 conical, tapering from the base to the apex; spores hyaline, 

 even, 5-6x3-3^ /x. 



