154 ULOTHRICACEAE 
Ulothrix submarina Kitz. Spec. Alg. 349. 1849; Tab. Phyc. 
Sit: of. تو کر‎ 18852. 
Hormiscia implexa Rabenh. Flor. Eur. Alg. 3: 364. 1868. 
DeToni, Syll. Alg. 1: 168. 1889. 
Ulothrix flacca Dodel-Port, Illust. Pflanz. 148. f. 28. 1883. 
Ulothrix subflaccida Wille, Vid.-Selsk. Skrift. 1900^ : 27. A. 3 
f. 90-100. 1901.(?) 
Light green, forming dense tufts or masses of interwoven and 
contorted filaments ; cells cylindrical or slightly swollen, 6-15 م‎ 
in diameter, about as long as broad or somewhat shorter ; cell- 
walls thin; chromatophore band often incomplete (approaching 
the parietal dish of S#chococcus in appearance), inclosing one 
pyrenoid ( M. 27, f. 7, 2). 
Exsıc.: Phyc. Bor. Am. 775A, Bridgeport, Conn., May, 1893 
(I. Holden); 7752, Malden, Mass., June, 1892 (F. S. Collins). 
On rocks, or less frequently on grasses, in regions more or less 
exposed to fresh water. 
New HAMPSHIRE : Little Boar's Head, 4 May, 1902 (F. S. 
Collins). 
RHODE ISLAND : Mackerel Cove, Conanicut Island, 21 e 
1898 (F. S. Collins). 
CONNECTICUT : Bridgeport, May (570). 
New York: Larchmont, October (520); New Rochelle, May 
(586). 
New Jersey: Underclift, April (275, 308). 
This species seems to furnish a point of connection between 
the more strictly marine species, U. flacca, and the series of ex- 
clusively fresh water forms. Batters (89) states that U. implexa 
grows on rocks near high-water mark exposed to the drip of fresh 
water. We have always found it well covered with water, fresh or 
salt. At Bridgeport it grows near the mouth of tidal creeks 
where the water is nearly as salt as in the sound. At New Ro- 
chelle it seems to grow mostly below the tidal line, but at the 
mouth of a stream of such force that the salt water influence 
would be largely modified. In the other two stations it was grow- 
ing near the mouth of streams exposed to salt water only during 
the flow of the tide. 
U. implexa was reported from Florida by Wolle, Bull. Torrey 
Club, 6: 287. 1879. 
