[Vol. 3 

 214 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



EypocTmus wmbrinus (Fr.) is noteworthy among the dark 

 species by its hyphae not being nodose-septate, i. e., not hav- 

 ing clamp connections. Its tubercnlate or aculeate spores and 

 compact hymenium afford additional distinctive characters. 



Thelephora umbrina Alb. & Schw. is regarded now by 

 European botanists as a Coniophora, of which I have a speci- 

 men from Bresadola; what Fries understood by T. umbrina 

 is exactly shown by an authentic specimen in Kew Herba- 

 rium. This specimen is a true Hypochnus in fine condition, 

 dark-colored, with compact hymenium separated from the 

 substratum by a thick layer of loosely arranged, suberect, 

 thick-walled, colored hyphae, which do not have clamp con- 

 nections. T, biennis, as used by Fries in 1821, is a descrip- 

 tion of the illustration in Bulliard's *Herb. de la France' 

 2:286. pi. 436. /. 2. Fries stated that he had seen no speci- 

 mens at that time. In * Hymenomycetes Europaei,' published 

 in 1874, he changed the description of T. biennis materially 

 to adapt it to living specimens which he had seen. The re- 

 supinate specimen of this later period in Herb. Fries is not 

 distinct from Hypochnus umhrinus. Authentic specimens of 

 H. tristis and Hypochnopsis fuscata received from Karsten, 

 and of Hypochnus sitnensis from Bresadola are the same 

 species as already pointed out by Bresadola;^ still earlier, 

 Eomell stated in letters his belief that H. tristis is a synonym 

 of H. umbrinus. My studies lead to the same conclusion. 

 The type specimen of Thelephora arachnoidea Berk. & 

 Broome agrees closely with the Friesian specimen of H. um- 

 brinus. Bresadola 2 has described hyphae of T. arachnoidea 

 as **punctato-scabrae vel tunica granoso-aculeolata primitus 

 inductae, usque ad 9fi crassae,'' but in my preparation of the 

 type of T. arachnoidea the walls of the hyphae are even and 

 not more than 4%/x in diameter.^ 



Ann. Myc. 1:107. 1903. 

 /5id., p. 108. 



'In the same connection Bresadola places Thelephora floridana Ell. & Ev. as 

 a synonym of T. arachnoidea, and he has been followed in this by von Hohnel. 

 My preparations of the type of T. floridana in N. Y. Bot. Gard. Herb, show 

 that this species is not a basidiomycete, and that its hyphae are nodose-septate. 



