REVISION OF THE Ховтн AMERICAN HYDNACEAE 135 
slender and to have a lilac tint rather than ochraceous. It is 
probable that it is a good species, but as no specimens except the 
type are known and a satisfactory description is not possible at 
present, it seems best not to include the species in the present 
genus until it can be further studied. If specimens are found they 
will probably be traced through the key to 5. ochraceum or S. 
Rhois from either of which they will probably be distinguished by 
the lilac colored teeth. 
Hydnum friabile Fries, Nov. Symb. Myc. 106. 1855. Тһе 
species was described from material received from Curtis. From 
the description it appears very close to H. pulcherrimum В. & C., 
and it would be regarded as a synonym of that species but for 
Ше fact that Fries himself notes this fact and says “ H. pulcher- 
rimum Berk. et Curt. aculeis multisque notis conspicue differt." 
In view of this definite statement it is best not to reduce the species 
to synonymy until the type specimen can be examined. 
Hydnum molle Schwein. Syn. М. Am. Fung. 162. 1834. 
Not Н. molle Fries. Тһе description is brief and suggests the pos- 
sibility of the species belonging to the genus /rpex of the family 
Polyporaceae. 
Several European species related to the present genus have 
been credited to this country, but as I have not seen the speci- 
mens they have not been included in the synopsis. These are as 
follows: М. occarium probably intended for H. occarinum Batsch 
reported by Schweinitz from Pennsylvania. Мо specimen was: 
found in the Schweinitz Herbarium. М. cirratum Pers. often 
written incorrectly czrzkatum, reported from Alabama, Beaumont ; 
Ohio, Lea; North Carolina, Curtis ; New York, Peck ; Kentucky, 
Morgan. It seems probable that the plants thus reported are 27. 
pulcherrimum or H. septentrionale. Н. geogenium Fr. reported 
from New York, Peck. The plant may be of this species but the 
determination is not wholly satisfactory. 
4. ECHINODONTIUM Ellis & Ev. Bull. Torrey Club ' 
27: 49. 1900 
Hydnofomes Hennings, Hedwigia 28: 267. 1901. 
Plant apodous, hard, woody, perennial; teeth woody ; hyme- 
nium beset with setae; spores smooth, guttulate, hyaline. 
