REVISION OF THE NORTH AMERICAN HYDNACEAE 157 
living and the dried plants could determine the species from her- 
barium specimens. І question even then if he would not be liable 
to some errors. 
Icow.: Fries, Icon. Select. Hym. 2/4 5. f. г. 
The description given above based on a large collection of mate- 
rial obtained by the writer in the summer of 1905 does not strictly 
conform to Fries’ account of H. scrobiculatum, but so closely do 
our plants answer to Fries' description and figure that it did not 
seem wise to treat these plants at present as a new species. Тһе 
most marked difference is Fries' statement ''stipite brevissimo, 
nudo, radicato," while our plants have a noticeable stem, always 
surrounded by a mass of spongy tomentum. 
6. Hydnellum concrescens (Pers.) 
Hydnum concrescens Persoon, Obs. Мус: т: 74. 1706, 
Plants terrestrial, mesopodous, gregarious, sometimes confluent, 
medium size, brown with light border; pileus expanded, de- 
pressed to subinfundibuliform, normally subround, but often de- 
substratum, 3-6 cm. wide; surface finely pubescent, often collicu- 
lose at center, distinctly zonate with shades of brown, darker at 
the center, the outer zones a light pink to whitish, the transition 
being very abrupt, becoming a uniform brown throughout in drying ; 
margin somewhat thick, rounded, sterile, even ; substance fibrous, 
tough, dry, obscurely zonate, reddish-brown ; stem short, irregu- 
lar, uneven, bulbous at the base with spongy tomentum, solid, light 
brown, finely tomentose, 1—2 cm. long, 6-10 mm. wide ; teeth 
slender, terete, tapering, acute, decurrent, dark brown at the base 
lighter at the tip, less than 1.5 mm. long, about 0.2 mm. wide ; 
spores subglobose, tuberculate, 3-4 и wide, brown; taste slightly 
bitter, unpleasant. 
Нав. : On ground in dry woods. Aug. 
RawcE: Maine, White ; Massachusetts, Francis; New York, 
Banker. | Ў 
The plants included in the above species аге usually referred to 
Hydnum zonatum Batsch, but they differ from that species as here 
interpreted in their larger size, relatively thicker pileus, and de- 
current teeth. Owing to the changes which the plant undergoes 
in drying, especially in color, it is very difficult to separate it from 
related species in herbarium specimens unaccompanied by field 
