1918] 



BURT THELEPHORACEAE OF NORTH AMERICA. X 



343 



(K 



5 o 



o 



I- 



Fig. 16 

 H. unicolor. 

 Section, a, X 44; 

 seta, 6, and spores, 

 s, X 850. 



tered in all parts of the setigerous layer, sometimes slightly 

 falcate, 50-60x5-6 /x, emerging up to 40 ju, tapering from the 

 base to a slender and sharp apex; basidia 

 with 4 sterigmata; spores in spore collec- 

 tion white, even, 5-5|x3|-4 /x; causing 

 pocketed rot in decorticated hard wood. 

 Covering decorticated poles 20 feet long. 

 On dead frondose wood. Cuba, Ven- 

 ezuela, and Brazil. December to April. 



B.. unicolor has the coloration and gen- 

 eral aspect of B.. cinnamomea and H. spreta 

 but is usually rimose in contrast with the 

 former and with a more velvety hymenium 

 than the latter and is of a very dense struc- 

 ture with its hyphae arranged parallel with 

 the rather uniformly distributed setae, 

 while H. cinnamomea and H. spreta are 

 stratose, with alternating layers of loosely 

 interwoven hyphae separating the two or more hymenial 

 layers. The dry rot produced in the wood by H. uni- 

 color is a pocketed rot, as shown by the fine collection 

 by Lloyd and well shown in his fig. 781, cited above, while the 

 rot produced by H. spreta is a soft, fibrous sap rot which at- 

 tacks the sap-wood uniformly from the outer surface. The 

 specimen referred by Berkeley and Curtis to H. fuliginosa, 

 collected in Cuba, C. Wright, 188, differs so slightly from the 

 type of H. unicolor that it will probably be included in H. uni- 

 color when better known by other collections. 



Specimens examined: 

 Cuba: C. Wright, 541, type (in Kew Herb.) and an unnum- 

 bered collection of 1857, under the name of H. cinnamomea 

 (in Curtis Herb.), and 188, under the name Hymenochaete 

 fuliginosa (in Kew Herb.) ; C. G. Lloyd, 142, 171 (in Lloyd 

 Herb., and in Mo. Bot. Gard. Herb., 55458, 55473) ; Ceballos, 

 C. J. Humphrey, 2585, 2590, 2696, 2829, 2964 (in Mo. Bot. 

 Gard. Herb., 16043, 16052, 1778, 14838, 1766). 

 Jamaica: Troy and Tyre, W. A. Murrill <& W. Harris, 991, 

 comm. by N. Y. Bot. Gard. Herb. 



