Chaetophora 215 



Colony irregularly extended and lobed or laciniate, 2 mm. to 

 i 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, 6-1 1 fi in diameter, cells 1-2 times as long 

 (pi. 38, f. 2,3). 



Exsic: Phyc. Bor. Am. 68. Middlesex Fells, Mass., May, 

 1890 (F. S. Collins). Hauck & Richt, 38 J. Middlesex Fells, 

 Mass., April, 1890 (F. S. Collins). Wittr. & Nordst. 310. Beth- 

 lehem, Pa., 1882 (F. Wolle). Tild. Am. Alg. 10. 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, 1 22, 282, 366, 577). 



South 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. //. 10. f. 3. 1727) and Dillenius (Hist. 

 Muse. 51. pi. 10. f. 10. 1741) leaves no doubt as to the identity 

 of his Ulva incrassata with the plant that has been known as 

 Chaetophora endiviaefolia or C. Cornn-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 Kutzing and Rabenhorst appear to be for the 

 most part at least, mere growth forms, and therefore they are not 

 enumerated here. 



