154 Ulothricaceae 



Ulothrix submarina Kiitz. Spec. Alg. 349. 1849 J Tab. Phyc. 

 2: pi. 94. f. 3. 1852. 



Hormiscia implcxa Rabenh. Flor. Eur. Alg. 3 : 364. 1868. 

 DeToni, Syll. Alg. 1 : 168. 1889. 



Ulothrix flacca Dodel-Port, Illust. Pflanz. 148. /. 28. 1883. 



Ulothrix subflaccida Wille, Vid.-Selsk. Skrift. 1900 6 : 27. pi. j. 

 f. go- 1 00. 1 90 1. (?) 



Light green, forming dense tufts or masses of interwoven and 

 contorted filaments; cells cylindrical or slightly swollen, 6-1 5 a 

 in diameter, about as long as broad or somewhat shorter ; cell- 

 walls thin ; chromatophore band often incomplete (approaching 

 the parietal dish of Stichococcus in appearance), inclosing one 

 pyrenoid {pi. 21, f. 1, 2). 



Exsic: Phyc. Bor. Am. 115 'A, Bridgeport, Conn., May, 1893 

 .(I. Holden); Z15B, Maiden, 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, 2 1 April, 

 1898 (F. S. Collins). 



Connecticut: Bridgeport, May (570). 



New York : Larchmont, October (520) ; New Rochelle, May 



(586). 



New Jersey: Undercliff, 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. implcxa 

 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. implcxa was reported from Florida by Wolle, Bull. Torrey 

 Club, 6: 287. 1879. 



