A Key to the More Frequently Occurring Freshwater Algae - Freshwater Algae: Identification, Enumeration and Use as Bioindicators - page 167

1a

2b

2a

1b

3

4a

4b

6b

6a 7b

5a

5b 7a

Plate VII 1 . Gloeotrichia : (a) colony, (b) filaments. 2 . Rivularia : (a) colony, (b) filaments. 3 . Cylindrospermum. 4 .
Aphanizomenon : (a) raft of filaments, (b) single filament. 5 . Lyngbya :(a) L. aestuarii ,(b) L. major. 6 . Phormidium :(a)
P. lucidum ,(b) P. autumnale. 7 . Chamaesiphon : (a) single cell with exospores , (b) colony.