Cushman : New England species of Closterium 129 



Cells small, moderately curved, 12-20 times as long as wide, 

 inner margin slightly tumid, gradually attenuated to the acutely 

 rounded apices ; cell-wall colorless and smooth. 



Length 133-153 fi ; breadth 7-12.5 /i. (Plate 5, figure 10.) 



Massachusetts : Reading ! Randolph ! Lake Watuppa, Fall 



River ! 



41. Closterium lineatum Ehrenb. 



Closterium lineatum Ehrenb. Infus. 96. pi. 6. f. 8. 1838. 



Wolle, Desm. U. S. 43. pi. 6. f. 16. 1884. — W. & G. S. 



West, Brit. Desm. 1 : 181. pi. 24. f. 1-5. 1904. 



Cells large, elongated, 1 5-30 times as long as wide, moder- 

 ately curved, median portion straight, ends more curved and 

 gradually attenuated to the broad, truncately rounded apices; 

 cell-wall yellowish or reddish-brown, with 1 2-20 striae across the 

 surface ; zygospores usually double, each part ovoid, walls smooth. 



Length 540-775 fi ; breadth 19-50^ ; apices 6-9 fi ; diameter 



of zygospore 78 fx. (Plate 4, figure 3.) 

 Maine: Scarboro (W. West). 

 Massachusetts: Near Salem {Bailey); Misery Island, off 



Weston 



Lake Wat 



Island : Wainsk 



Nyatt ! 



4i#. 



LINEATUM COSTATUM Woll 



Closterium lineatum 



W 



pi. 61. f. 3. 1887 ; Desm. U.S. 45- pi- ™. f. 3. 1892. 

 Johnson, Bull. Torrey Club 21 : 286. 1894. 

 Cells with coarser and fewer costae. 

 New Hampshire : Rochester (Wolle). 



Connecticut : Bridgeport (Johnson, W. & G. S. West). 



♦42. Closterium Ralfsii Breb. 



pi. 30. f. 



uosterium Ralfsii Breb. in Kalts, tfrir. v**™. >,*. 



1 848.— Wolle, Desm. U. S. 46. pi- 7- / I0 ' 1 88 ^— W * 

 & G. S. West, Brit. Desm. I : 182. pi 24. f. 6, 7. 1904- 



Cells large, 8-10 times as long as broad ^^ d J ^{ 

 inner margin much inflated for over half the length of the cell, 

 somewhat abruptly attenuated toward the ends, wh «h are some- 

 what produced and incurved, apices obtuse; cell-wall Y^sh 

 or reddish-brown with about 30 striae v.s.ble across the surface. 



