Cylindrospermopsis raciborskii is seen here between 2 filaments of Aphanizomenon ovalisporum from Lake Kinneret, showing the differences between those species. C. raciborskii typically has gas vesicels at the end cell, while the end cell of A. ovalisporum is mostly empty and often thinner than the rest of the cells in the trichome.
aalster and tzohary
A Alster & T Zohary, Kinneret Limnological Laboratory, IOLR
Harmful Algae of Europe Lake Kinneret planktonic life forms