Cushman: New England species of Closterium 115 



New Hampshire : Intervale ! 

 Massachusetts : Lake Watuppa, Fall River ! 

 Rhode Island : Nyatt ! 



10. Closterium striolatum Ehrenb. 

 Closterium striolatum Ehrenb. Phys. Abh. Akad. Wiss. Berlin 

 1830: 68. 1832. — Wolle, F.-W. Alg. U. S. 24. pi. 55. f. 

 5-8 ; Desm. U. S. 44. //. 6. f. 5-8. pi. 7. / 8, 20. 1892. 



W. & G. S. West, Brit. Desm. 1: 122. pi. ij. f. j-16. 

 1904. 



Cells of medium size, moderately curved, 8-12 times as long 

 as wide, apices broadly truncate, angles rounded ; cell-wall yellow- 

 ish-brown, with 12-20 striae visible across the cell. 



Length 220-375 //; breadth 19-44 n; apices 9-12.5 



late 



3> figure 10.) 



Maine : Basin Mills and Orono {Hi 



[Johnsoh 



Meredith 



West); Lake Q 



Worcester {Stone); near Salem {Bailey); Bridgewater ! Pondville ! 



ham (zygospores) ! 



Wat 



10a. Closterium striolatum erectum Klebs ■ 



Closterium striolatum erectum Klebs, Schrift. Physik.-oekonom. 



Gesells. Konigsberg 22 : 14. pi. 2. /. j, 4 o, 4 c, 10. 1879. 



Resembling the typical, but with the median portion straight 

 a "d the ends abruptly curved. 



Length 360 ft; breadth 34//. (Plate 3, figure II.) 



New Hampshire: North Woodstock! 



Although this variety may be connected with the typical form, 

 ft was very common at this one locality and the typical form was 

 absent. 



Closter 



II. 



Closterium intermedium Ralfs 



//. 2g. f. 



1848.— W. & G. S. West. Brit. Desm. 1 : 125. pi. 14. / 



1 



904. 



£ strioh 



atum 



5 



2 55- 1903; 7: 115. 1905. 



