198 
Mycologia 
Hydnelliim sangninariiwi Banker was proposed as a substitute 
for the untenable Hydnum fcrrugineum Fries at a time when we 
regarded the red juice as having much weight in the separation 
of species. As treated by us in the work cited it dififers in no 
other essential particulars from our treatment of H. scrobic- 
iilatiun Fries. 
Hydnellum hybridum (Bull.) 
Hydnum hybridum Bull. Hist. Champ. Fr. 307. 1791. 
Hydnum Qucletii Fries, Quel. Champ. Jura Vosg. 277. 1872. 
There is no type of H. hybridum Bull, in existence and our 
forms are referred here solely on the basis of Bulliard’s descrip- 
tion and figures. The radiating rugae appear to be the most 
characteristic feature of the segregation. This character, how- 
ever, is sometimes obscure and it is then difficult to distinguish the 
plants from H. scrobiculatum. 
The type of H. Queletii is preserved in the herbarium at Upsala 
and is a typical specimen of the segregation which we refer to 
H. hybridum Bull., having the radiate rugae especially well de- 
veloped. The plants of this segregation have been quite com- 
monly referred to H. scrobiculatum by the most eminent mycolo- 
gists, often to H. zonatum Batsch, and even apparently by Fries 
himself to H. fcrrugineum Fries. 
Hydnellum Vespertilio (Berk.) 
Hydnum Vespertilio Berkeley, Hooker's Jour. Bot. and Kew 
Card. Miscel. 6: 167. 1854. 
In the original description of this species Berkeley emphasized 
the fact that it was black and suggested a possible relationship to 
Hydnum nigrum Fries. This was misleading and, as the descrip- 
tion was based on specimens from India and suggested no Amer- 
ican forms, little attention was paid to it. In searching through 
the Berkeley Herbarium at Kew, however, specimens were found 
marked according to notes taken at the time “ Hydnum vesper- 
tilio, Berk. Nunklow July 10, i860.” These specimens were at 
once recognized as similar to certain undetermined American 
forms belonging in the genus Hydnellum. They are undoubtedly 
the type of Berkeley’s species as that author cites for his type 
