

Cushman : New England species of Closterium 123 



67. 1817. 



//. jo./. 26. 1884. 



W. & G. S. West, Brit. Desm. 1 : 150. //. 18. f. 8, p. 1904. 



Cells large, stout, 6-7 times as long as wide ; axis nearly 

 straight, outer margin curved, inner margin nearly straight, or 

 slightly tumid in the middle, becoming somewhat concave toward 

 the ends, apices often slightly recurved, obtusely rounded ; cell- 

 wall colorless, smooth. 



Length 465-650// ; breadth 71-93 ju ; apices 12-15 /"• (Plate 

 4, figure 18.) 



Maine : Oldtown and Great Works (Ht 

 New Hampshire : Pudding Pond, Norl 

 th Woodstock ! 



1 



Massachusetts: Amherst (W. West); near Salem (Bailey); 



Misery Island, off Beverly ! Reading ! Gay Head, Marthas Vine- 

 yard ! 



Rhode Island : Nyatt ! 



Wolle's figure of this species is not a good one, as he notes. 



26a. Closterium Lunula intermedium Gutw. 



Closterium Lunula, var. intermedium Gutw. Rozpraw. Wydz. 

 matem.-przyr. Akad. Umiej. Krakow. 32 : 39. //. 6. f. 17. 



1897. — W. & G. S. West, Brit. Desm. I : 152. pi. 18. f. 12. 



1 904. 



Cells with the outer margin more convex, the inner margin 

 broadly convex, ends abruptly narrowed to the truncate apices. 

 Length 440-540//; breadth 65-94 ft. 



Massachusetts : Lake Watuppa, Fall River ! Gibbs Pond, 

 Nantucket ! 



26b. Closterium Lunula minus W. & G. S. West 



Closteri, 



W. & G. S. West 



I: 151. 1904. 



Smaller than the typical form ; the cell-wall faintly straw- 



colored. 



Length 403 fi ; breadth 56//. 

 New Hampshire : Intervale ! 



* 26c. Closterium Lunula maximum Borge 



C[ osterium Lunula, var. maximum Borge, Arkiv for Botanik 



77- pi. 1. f. p. 1903. 



1 : 



