Fig. 4

Terminal cells, vegetative cells, heterocytes, and akinetes of the four Aphanizomenon taxa investigated from studies cited. A-1, B-1, C-1, D-1 Aph. flos-aquae—after Komárek (1958). A-2, B-2, C-2, D-2 Aph. klebahnii—after Komárek et Kováčik (1989). A-3, B-3, D-3 Aph. skujae—after Skuja (1956) and Komárková-Legnerová et Cronberg (1992). A-4, B-4, C-4 Cuspidothrix issatschenkoi—after Usačev from Kondraeva 1968 and after Hindák et Moustaka (1988)