680 



J. Woîoszyiiska: 



Sectio IL Anabaenopsis. 

 1. Filis brevissirnis, spiraliter (rarissime rectis) dispositis. an- 

 fractibus 1 — 3; cellulis sphaericis. oblongo-ellipticis vel oblongis. 

 Crassitudo trich. 4*5 — 6 fi; crass. heterocyst. 5 — 8 pi, 



Anabaena circularis Gr. S. West. 



Fig. 8. Anabaena sphaerica Born. et Flah. f. tennis G. S. West. (Die erste 

 Zeichnung von Herrn Prof. M. Raciborski gemacht). 



Crass. trich. 5 — 8 [i; crass. heterocyst. minor. 



Anabaena circularis v. javanica n. v. 

 2. Filis brevissirnis rectis vel spiraliter contortis, anfractibus 

 1 — 3. inter cellulas non constrictis, cellulis cylindricis. 

 Heterocyst. oblongo cylindricae. 



Anabaena Tanganyikae G. S. West. 

 Heterocyst. oblongo conicae. 



Anabaena Raciborskii n. sp. 



