116 Cushman : New England species of Closterium 



C. slriolatum Ehrenb., var. elongatiim Cushman, /. c. 115. 1905. 

 C. subdirectiim West, Jour. Roy. Micr, Soc. 1889: 17. //. j. f. 

 16. 1889. 



Cells of medium size, 1 1— 1 3 times as long as wide, moderately 

 curved, apices truncate with rounded angles ; cell-wall yellowish- 

 brown, with 7-10 striae visible across the cell. 



Length 220-370/*; breadth 19-28 fit; apices 8-1 1 fi. 



Maine: Kittery! 



New Hampshire : Intervale ! 



Massachusetts: Amherst (W. West)\ South Framingham! 

 Plainville ! Pondville ! East Bridgewater ! North Watuppa Lake, 

 Fall River ! Westport ! Swansea ! 



Rhode Island : Nyatt ! 



*i2. Closterium Ulna Focke 

 Closterium Ulna Focke, Physiologische Studien 59. pi. 3. /■ 3°- 



1847.— W. & G. S. West, Brit. Desm. 1 : 127. pi. 14./. 7'9- 

 1 904. 



Cells of medium size, about 30 times as long as wide, apices 

 truncate ; cell-wall slightly yellow, with 1 5-20 fine striae visible 

 across the cell. 



Length 370//; breadth n. 5//; apices 7.5//. (Plate 3 



» 



FIGURE 9.) 



Massachusetts : Randolph ! 



The specimens from this locality were very elongate, otherwise 

 they were typical. 



13. Closterium juncidum Ralfs 



Closterium juncidum Ralfs, Brit. Desm. 172. //. 29. f. 6. iU%- 



pi. 6. f. 2, 3. 1884.— W. & G - 



S. West, Brit. Desm. 1: 128. pi. 14. f. 10-14. 1904 

 Cells long and slender, 30-45 times as long as wide, median 

 portion straight and of uniform width, apices slightly curved, ob- 

 tusely rounded ; cell-wall yellowish-brown, with 5-7 striae visible 



-375 P ; breadth 6-8 . 5 u ; apices 3.5 a. (Plate 3. 



across the cell. 

 Length 210 



FIGURE 18.) 



(//, 



New Hampshire : Saco Lake (Wood); Pudding Pond, North 



Conway ! 



