Cushman : New England species of Closterium 127 



34. Closterium attenuatum Ehrenb. 



Closterium attenuatum Ehrenb. Infus. 94. pi. 6. f. 4. 1838. 



Wolle, Desm. U. S. 41. //. 8. f. 5. 1884. — W. & G. S. 



' West, Brit Desm. I : 169. pi. 22. f. i-j. 1904. 



Cells large, about 1 1 times as long as wide, slightly curved, 

 gradually attenuated toward the ends, where they are suddenly 

 contracted into the obtusely rounded apices ; cell-wall reddish- 

 brown in color, with about 20 striae visible across its surface. 



Length 465 ft ; breadth 45 /jt. 



Maine : Frog Pond, Orono (Harvey). 



New Hampshire : Pudding Pond, North Conway ! 



35. ClosteriUxM turgidum Ehrenb. 



Closterium turgidum Ehrenb. Infus. 95. pi. 6. f. 7. 1838. 



Wolle, Desm. U. S. 41. //. 6. f. 15- 1884.— W. & G. S. 



West, Brit. Desm. 1 : 170. //. 22. /. 4, 5- ! 9°4- 



Cells large, somewhat curved, about 13 times as long as wide 

 ends recurved, apices subtruncate ; cell-wall reddish-brown, with 

 30 or more fine striations visible across the surface. 



Length 682 // ; breadth 53 ji ; apices 12 ft. 



Maine : Orono (W. West). 



Massachusetts : Near Salem (Bailey) ; Lake Watuppa, Fall 



River! 



• Rhode Island : Providence (Bailey). 



*36. Closterium Pritchardianum Arch. 



Closterium Pritchardianum Arch. Proc. Dubl. Nat. Hist. Soc. 3 2 : 

 250. pi. 12. f. 2 5-27 . 1862. -W.&G.S. West, Brit. Desm. 



I: 172. pi. 22. f. 6-14. IQ°4- 

 C turgidum, forma intermedium Cushman, Rhodora 7:116. 1905. 



Cells large, only slightly curved, about 15 times as long as 

 *, inner margins nearly straight, ends slightly ^ curve ^ ,Ce * 

 truncate ; cell-wdl reddish-brown, with nearly 40 stnae, composed 



°fpunctae across the surface. rp . 



Length 400/;; breadth 28//; apices 7-9^ ^ rLAit 4 ' 



p lGURE 5.) 



New Hampshire : Intervale ! 



37. Closterium pronum Breb. 



Cl °sterium pronum Breb. Mem. Soc. Sc. Nat. Cherbourg 4 : I 57- X 



* / 42. 1856. -Wolle, F.-W. Alg. U. S. 25. //. 55- f> ** 



