REVISION OF THE Хоктн AMERICAN HYDNACEAE 153 
Icon. : Fries, Icon. Select. Hym. ф/. 4. 
The species may be distinguished from related species with 
which it is likely to be confused by its red juice, from 77. Cardun- 
culus Secr., which also has red juice it may be readily distin- 
guished by its lack of odor and mild taste. But unfortunately 
these characters are indeterminable in the dried plants and it is 
then very difficult to say with certainty to which of several species 
a given specimen may belong. A considerable number of collec- 
tions have had to be set aside, as in the dried state, with no 
notes on the fresh characters, it was impossible to decide with any 
degree of satisfaction whether the plants represented H. sanguina- 
rium, Н. concrescens, H. scrobiculatum, or some undescribed form. 
In fact, the distribution as given above must be regarded as sub- 
ject to some uncertainty. It is probable that specimens of this 
species are commonly referred to Hydnum scrobiculatum Fries, but 
a red juice has never been ascribed to that species. Our plants con- 
form well to figures and descriptions of Hydnum ferrugineum Fries, 
but are rarely so large as that plant is represented. А specimen 
received from Bresadola presents characters intermediate between 
the above species and H. Carbunculus, having the odor and whitish 
pubescence of the latter, and the depressed colliculose pileus of the 
former. It may be that the European plant is distinct from either 
of our American forms. Observations on the fresh plants, in- 
cluding taste, odor, and character of juice, are very desirable. 
H. ferrugineum Fries is preoccupied by H. ferrugineum Pers., 
a resupinate plant, and therefore the name must be changed. 
3. Hydnellum velutinum (Fries) 
Hydnum velutinum Fries, Sys. Myc. І: 404. 1821. 
Calodon velutinus Karsten, Ryssl. Finl. och den Skand. Half. 
Hattsv. 2: 109. 1882. 
Hydnum spongiosipes Peck, Rept. N. Ү. State Миз. Nat. Hist. 50: 
МЕ. 1597 
Plants terrestrial, mesopodous, low, broad, dark brown through- 
out, gregarious, sometimes confluent ; pileus obconic, subrotund, 
slightly irregular, strongly convex, center often depressed, 1—10 
cm. wide; surface finely tomentose to pubescent, subeven, or oc- 
casionally radiately subrugose, azonate, rarely a single concentric 
