p 



Cushman : New England species of Clostertum 113 

 Length 360-527 fit ; breadth 1 1-16/U ; apices 4-5"6> (Plate 



3, figure 17.) 



New Hampshire : Intervale ! 



Massachusetts : Carver's Pond, Bridgewater ! Lake Watuppa 



Fall River ! Eastham ! 



6. Closterium angustatum Kiitz. 



Closterium angustatum Kiitz. Phyc. Germ. 132. 1845. — Wolle, 

 Desm. U. S. 40. //. 6. f. 21. 1884.- W. & G. S. West, 



Brit. Desm. 1 : 119. //. 12. f. 11-13- ! 904- 

 Cells of. medium size, moderately curved, 10-18 times as long 

 as wide, apices truncately rounded ; cell- wall reddish- or yellowish- 

 brown, ends darker, usually 4 costae visible across the cell. 

 Length 240 ft ; breadth 20 p ; apices 1 5 ft. 



Maine : Orono ( W. West). 



Massachusetts: Berkshire Mts. ( Wolle) ; Tewksbury (Lager- 



J mm). 





Rhode Island : Wainskut Pond, North Providence {BrnUy). 



Although this species has several times been reported from 

 New England, all the New England specimens seen in the material 

 I have examined belong to the following variety, and some ot the 

 previously recorded specimens are placed there. 



7. Closterium angustatum clavatum Hastings 



Closterium angustatum clavatum Hastings, Am. Month. Micr 

 Jour. I3 155- PL /•/ 7- 1892- Johnson, Bull. Torrey 



Club 22 : 291. pi. 239. f. 6. 1895. 



Cells larger than the typical, ends tumid and clavate ; cc U -wall 

 with 3 or 4 costae visible, often spirally twisted a the apice^ 



Length 3 5 5-650 fi ; breadth 2 1-34^ I a P lces J 5" 2 1 * (FLATE 

 3, figure 12.) 



Maine : M 



New Ha i\rr 



( Wood ) 



(Hastings) ; North Woo 



! 



Massach 



Riv 



East Bridgewater ! Lake Watuppa, Fall 



Connecticut : Bridgeport, scarce (Johnson) 

 Wolle describes var. ret.ulatum and var. *~°£*^ % 

 which evidently apply to the same thing. Just what Wolle had, 



