130 Cushman : New England species of Closterium 



Length 428-496// ; breadth 52-54//; apices 10-12//. 



Massachusetts : Lake Watuppa, Fall River ! 

 Rhode Island : Nyatt ! 



\2a. Closterium Ralfsii hybridum Rabenh. 



Closterium Ralfsii, var. hybtidnm Rabenh. Krypt.-Fl. Sachs. 174. 

 1863. — W. & G. S. West, Jour. Linn. Soc. Bot. 33: 284. 

 1898 ; Brit. Desm. 1 : 183. //. 24. f. 8-13. 1904. 



Cells longer than the typical, 13-16 times as long as broad, 

 ventral inflation less prominent, apices subtruncate. 



Length 356-682 fi ; breadth 24-53 f* i apices 6-1 5 p. (Plate 

 5, figures 8, 9.) 



New Hampshire: Pudding Pond, North Conway ! 

 Massachusetts : Winchester ! Reading ! Randolph ! Eastham! 

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



*42b. Closterium Ralfsii immane var. nov. 



Cells similar to C. Ralfsii, but larger, very tumid, about 9-1 1 

 times as long as wide, rather abruptly attenuated to the rounded 

 apices ; cell-wall yellow or reddish-brown, with 30-50 striae across 



ft; breadth 67-75 t l \ apices 1 1-12 //. (Plate 



4, figure 4.) 



the surface. 



0-806 



Massachusetts : Lake Watuppa, Fall River ! 



43. Closterium Braunii Reinsch 



Closterium Braunii Reinsch, Algenfl. Frank. 196. pi. 



1 



1867. — W. & G. S. West, Trans. Linn. Soc. Bot. II. 5 

 236. pi. 13. f. 16, 17. 1896. 



ireolatum Wood, F.-W. Alg. in. pi. 11. f 6. 1874.— Woll< 

 Desm. U. S. 43. pi. 8.fj, 4 . 1884. 



Month. Micr. Jour. 13 : 154 



/. 



f. J. 1892.— Johnson, Bull. Torrey Club 22: 291. pi- 239' 

 f 7. 1895. 



Cells large, very slightly curved or straight, central portion 

 straight, then rather abruptly attenuated to the broadly truncate 

 ends ; cell-wall yellowish or reddish-brown, with 10-20 striae or 

 costae, each made up of a double row of elongated granules. 



Length 622 fi ; breadth 43-50 /i ; apices 10-1 1 //. 



Maine : Scarboro (W.& G. S. West). 



Connecticut : Bridgeport, rare {Johnson). 



