191S] 



BURT THELEPHORACEAE OP NORTH AMERICA. X 



317 



Fig. 5 



H. borealis. 



Section X 68. From type. 



See vl' 16, f. 6. 



Brazil : Rio Grande do Sul, J. Rick, in Rick, Fungi Austro- 



Am., 31. 

 Paraguay : in Balansa, PI. du Paraguay, 3916 (in Kew Herb.). 

 Chile: Central Chile, R. P. Nataniel Costes (in N. Y. Bot. 



Gard. Herb., and in Mo. Bot. Gard. Herb., 44782). 



7. H. borealis Burt, n. sp. 



Type : in Burt Herb. 



Fructifications thin, pliant, imbricated, reflexed, attenuated 

 towards the base, or umbonate-sessile and attached along one 

 side, radiately fibrillose, concentrically ridged, Brussels- 

 brown to cinnamon-brown; hymenium 

 even, not cracked, snuff-brown; in 

 structure 240-340 ju thick, with the 

 setigerous layer 60 ii thick, and with 

 the hyphal layer not bordered on 

 either side by a dense, dark zone, and 

 having its hyphae rather loosely in- 

 terwoven and longitudinally arranged, 

 colored, 2^ /x in diameter; setae scat- 

 tered, 60-90x71-10 ii, emerging up to 60 /x, starting from all 

 parts of the setigerous layer ; spores hyaline, even, 4-6x2-3 n. 



Fructifications 8-12 mm. in diameter, reflexed portion up 

 to 4 mm. long. 



On decorticated frondose wood. Ontario to New Jersey. 

 October to April. Rare. 



E. borealis is distinguished by having a simpler structure 

 in section than any other of the pileate species which occur 

 in the north. The absence of dark, dense zones bordering on 

 an intermediate layer separates it at once from E. badio- 

 ferruginea. E. attenuata of the East Indies is a closely re- 

 lated species but the latter has its pileus strigose-hirsute. 



Specimens examined: 

 Ontario: London, J. Dearness, 1017 (in N. Y. Bot. Gard. 



Herb., and in Mo. Bot. Gard. Herb., 55513). 

 Vermont : Abby Pond, Ripton, E. ^A. Burt, type. 

 New Jersey: Newfield, J. B. Ellis (in N. Y. Bot. Gard. Herb., 



and in Mo. Bot. Gard. Herb., 55503). 



