بی رتو چس ee‏ ن تن | EL‏ 
4 
CHAETOPHORA 215 
Colony irregularly extended and lobed or laciniate, 2 mm. to 
1 dm. long, consisting of elongated filaments held together by 
mucus in sheaf-like fascicles; branches alternate or secund, bear- 
ing densely crowded terminal fascicles of branchlets which are 
usually long-setiferous ; cells of filaments 8-16 ¢ in diameter, 2-6 
times as long, cylindrical or inflated; terminal branchlets often 
torulose and curved, 6-11 م‎ in diameter, cells 1-2 times as long 
(A. 36, f. 2, 3) 
Exsic.: Phyc. Bor. Am. 68. Middlesex Fells, Mass., May, 
1890 (F. S. Collins). Hauck & Richt, 387. Middlesex Fells, 
Mass., April, 1890 (F. S. Collins). Wittr. & Nordst. 570. Beth- 
lehem, Pa., 1882 (F. Wolle). Tild. Am. Alg. zo. Hennepin 
county, Minn., 1894; 267. King county, Washington, July, 
1897; 268. Chester county, South Carolina, April, 1896 (H. A. 
Green). 
On stones, sticks and leaves in brooks. 
VERMONT: Alburg, June (682). 
MassacHusETTS: Cambridge, 24 May 1891 (L. M. Under- 
wood). 
Connecticut: New Haven, May, 1885 (W. A. Setchell). 
New York: Van Cortlandt Park, April to June (98, 345, 
346, 407, 601, 636). 
New JERSEY: Grantwood, April, May (94, 122, 282, 366, 577). 
SourH DAKOTA: June 28, 1897 (D. Griffiths). 
Montana: Great Falls, August, 1885 (F. W. Anderson). 
The reference by Hudson to the excellent figures of Vaillant 
(Botanicon Parisiense, 56. ۸ ro. f. 3. 1727) and Dillenius (Hist. 
Muse. 51. ۸. ro. f. 10. 1741) leaves no doubt as to the identity 
of his Ulva incrassata with the plant that has been known as 
Chactophora endiviacfolia or C. Coruu-Damae ; hence the neces- 
sity for reviving this ancient name which antedates Roth by 
nearly twenty years. 
The two manuscript names above quoted are here inserted be- 
cause they have been erroneously referred to Draparnaldia op- 
posita, (See discussion under that species.) 
The numerous varieties of this species that have been pro- 
posed chiefly by Kützing and Rabenhorst appear to be for the 
most part at least, mere growth forms, and therefore they are not 
enumerated here. 
