Harper—Additional Species of Pholiota. 417 
through the pileus of a plant at about the stage of develop¬ 
ment of E. There is shown (a) the dark colored cortical 
layer, (b) the central portion of the pileus with lighter col¬ 
ored tissue, (c) the dark subhymenial layer, (d) the gill 
chambers covered on their bottom and sides with the hy- 
menium. The spores have not formed. Later the gills are 
blackened with the spores except on their edges which remain 
white and floccose where they were torn from the tissue of the 
partial veil, (e) the partial veil appearing as a light colored 
layer about the stem. It is fluted by the grooves made by the 
edges of the gills, (f) the context of the stem, (g) the light 
colored medullary sheath. 
THE PSILOGYBE SPADICEA GROUP 
1. Hypholoma hydrophilum Bull. PI. XXIV. 
The plants I have referred to this species were collected by 
Dr. Mary Whetstone on a lawn in Minneapolis, Minn. 
They are closely related to Psilocybe spadicea and appear to 
belong to the same group. The spores of the two species are 
alike in shape, size and color, 3—5x7—9 p, but Hypholoma 
hydrophilum is furnished with very numerous dart shaped 
colored cystidia about 15—20x55—70 p. These cystidia are 
the most distinctive mark of the species. The plants differ 
from Psilocybe spadicea also in the appendiculate veil which 
hangs in patches from the margin of the pileus in young 
plants, but soon disappears, in the more solid substance, the 
more irregular, rugose wrinkled and repand pileus, the 
fibrillose stem striate at the apex and the absence of incarnate 
hues on the lamellae. All these features are characters of 
Hypholoma hydrophilum. 
Pileus J —3 inches broad, ovate to convex and expanded, 
somewhat firm and fleshy, repand, striate or rugose wrinkled 
especially near the incurved margin, disk smoother and 
even, hygrophanous, tawny or yellowish brown becoming 
pale avellaneous. Sometimes with scattered white squamules 
when young. Lamellae adnexed, rounded behind, narrow, 
not crowded, whitish becoming dark brown. Stem 2—3 
inches long, 3 lines thick, hollow, equal or slightly tapering 
upward, somewhat striate above, white or pale cream col¬ 
ored. Spores dark rusty brown, 3—5x7—9/x, basidia 
