Cyanoprokaryotes are probably the oldest organisms with plant metabolism. However, their cell structure and type of asexual reproduction prove their eubacterial origin. They are able to colonize all possible biotopes, including very extreme environments (thermal springs up to 80 C, rocks in extremely hot or cold deserts in both the tropics and Antarctica, hypersaline lakes and marshes, biotopes in volcanic regions, and other harsh habitats).

This book was written for identification and standardization of known, morphologically and ecologically distinguishable...