CHARACH A. 
Plants growing under water in ponds and slow streams, resembling 
Alge, with which they are classed by some authors. Some of 
the species have the very disagreeable odor of sulphuretted hy- — 
drogen. The classification is taken from a recent paper upon © 
the subject by Byron D. Halsted, D. S. (Proc. Bost. Nat. Hist., — 
Vol. XX, p. 169; March 5, 1879). The specimens have all been 
identified by Prof. Farlow and Dr. Halsted, to whom the writer © 
would here acknowledge his indebtedness. 
NITELLEZ. 
Nitella opaca, Ag. 
Specimens of a Nitella collected at Swampscott in a spring hole, ; 
May 11, 1879, are referred to this species by Dr. Farlow, who says: 
—‘¢The specimens are all male, and the plant seems to be dic- 
cious. If I am correct in supposing it to be diccious, the species — 
belongs to the group of N. capitata, to which N. syncarpa, N. cap- | 
itata, and N. opaca belong. The color is lighter than most forms — 
of N. opaca, but I am disposed to refer it to that species which it 
resembles in habit” (Letter, Nov. 16, 1879). This determination 
has since been confirmed by Nordstedt (note, Dr. Farlow, Jan. 8, 
1880). 
Witella flexilis, Ag. 
Common in ponds and streams. Chebacco pond; Merrimac river, | 
above the dam at Lawrence; in a somewhat brackish stream near 
Burley Farm, Danvers; Wenham pond. Dr. Halsted refers to 
certain Essex county specimens as approaching the 
Var. nidifica. (Chara glomerulifolia, ci Br.), and (N. flexilis, var. ~ 
subcapitata, A. Br.). 
He also speaks of specimens of this species as having been col- 
lected in the ‘‘ Merrimac (Green),” probably B. D. Greene. 
Nitella gracilis (Sw.), Ag. 
Chebacco pond, near Whipple’s boat-landing. The specimens are 
all of the delicate form. 
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