19161 



BURT THELEPHORACEAE OF NORTH AMERICA. VII 



341 



Fig. 12 

 S. fumigatum. 

 h, portion of hymenium showing hy- 

 phae bearing probasidia and terminat- 

 ing in curved and coiled ends; b, three 

 spore-bearing organs; s, spores. X 640. 



ing from substratum to liymenial region; in the hymenial 

 region the hyphae become more densely interwoven and 

 bear laterally numerous hya- 

 line, subglobose probasidia 

 12-15/t in diameter, and 

 terminate in small, curved 

 or loosely coiled, colored 

 branches — hardly paraphy- 

 ses — 2(1 in diameter, which 

 form the surface of the hy- 

 menium ; spores simple, hya- 

 line, even, slightly curved, 

 12-15 X 5-6/x, borne on the 

 upper three cells of a few- 

 celled, nearly straight, hya- 

 line, spore-bearing organ 40- 

 50 X 6-71/2/") into which the 

 probasidium develops. 



Up to 5 m. long, several cm. broad, %-iy2 nim. thick. 



On trunks of living sajDling of Acer ruhrum and probably 

 other species. South Carolina, Alabama, and Cuba. Novem- 

 ber to May; spores most numerous in May. 



S. fumigatum has the general habit and color of Hypoch- 

 nus spongiosus and is readily distinguishable among the 

 North American species of Septobasidium by its mouse- 

 gray color, tomentose surface, and felty structure of loosely 

 interwoven hyphae which do not form pillars. It is only 

 rarely that I have seen spores or evidences of spore produc- 

 tion upon other than the terminal cell in this species. 



Specimens examined: 

 South Carolina: Gourdin, C. J. Humphrey, 2588, type (in 



Mo. Bot. Gard. Herb., 43822). 

 Alabama : Montgomery, R. P. Burke, 50, and an unnumbered 



collection (in Mo. Bot. Gard. Herb., 11382, 20068). 

 Cuba: C. Wright, Fungi Cubenses Wrightiani, 838, comm. 



by W. G. Farlow (in Farlow Herb, and Mo. Bot. Gard. 



Herb., 43907). 



