REVISION OF THE NORTH AMERICAN HYDNACEAE 109 
holz, A. 50. f. 1-0; Peck, Кері. М. Y. State Mus. 48: pl. 38; 
Rept. Conn. Board Agric. 29: p/. 6, f. 2; Sowerby, Eng. Fung. 
pl. 176. 
Besides its unusual cosmopolitan range this species appears to 
possess extreme variability. Several attempts have been made to 
split it up into distinct species but without very great success. 
The following key may assist in some degree in separating the 
principal forms peculiar to this country and is offered as an aid to 
a better knowledge of this difficult aggregation. 
Plants reddish buff 
Plants small, averaging less than 4 cm. wide, often umbilicate, spores large, 8-104 
wide. Form A 
Plants large, stout, reaching 12 сіп. wide, average width of сар 6-8 cm.; pileus 
often cracked, sometimes into thick scales, deeply umbilicate, spores 7-8 и 
wide. Form В. 
Plants pale buff to cream-colored, slender, medium size, averaging 4-6 cm. wide, 
rarely 8 cm., spores 7-8 u wide. Form С. 
Form А is presumably Hydnum umbilicatum Peck, loc. си. 
In all of the above forms none of the characters ascribed appear 
to be constant, while intermediate forms are readily found that 
connect them most intimately. Whether these forms can be 
regarded as true species or even as varieties can only be decided 
by a careful study of the living plants.* The extreme seasonal 
range of this species is due to its northern and southern dis- 
tribution. 
4. Нурмом савврітовум Banning ; Peck, Rept. N. Y. State 
Mus. 44: 74. 1891 
Plant terrestrial at base of trees and stumps, mesopodous, ces- 
pitose, yellowish, 6 cm. high ; pileus convex to expanded or sub- 
plane, subregular, even, 4 cm. wide, subconfluent, margin even; 
surface appressed-fibrous, pale ochre, yellow, or dark flesh-colored ; 
substance fleshy, white, turning yellow when cut ; stem solid, sub- 
cylindrical, subflexuose, floccose above, subglabrous below, whitish, 
staining yellow when bruised, 6 cm. long by 1 cm. wide, united at 
the base; teeth short, conical, acute, decurrent, pale ochre or 
light flesh color, less than 3 mm. long, 2 or 3 to one millimeter ; 
spores subglobose, 7 и wide ; taste mild. 
* A fall discussion of the variability of this species will be found in Torreya 4 : 113. 
