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International Journal on Algae
SJR: 0.219 SNIP: 0.261 CiteScore™: 0.24

ISSN Druckformat: 1521-9429
ISSN Online: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v4.i2.60
pages 72-85

Variability of life cycles of Nostoc Vauch. (Cyanophyta) and problems of systematics

N. V. Kondratyeva
N.G. Kholodny Institute of Botany, National Academy of Sciences of Ukraine, 2, Tereshchenkovskaya St., 01001 Kiev, Ukraine
O. A. Kislova
N.G. Kholodny Institute of Botany, National Academy of Sciences of Ukraine, 2, Tereshchenkovskaya St., 01601 Kiev, Ukraine

ABSTRAKT

The taxonomic significance of a number of characters (life cycle type, morphological peculiarities of individuals during certain stages of the life cycle, dimensions and shape of vegetative cells within individuals of a certain age, peculiarities of akinetes, etc.) is discussed on the basis of authors' investigations and analysis of the literature data concerning ontomorphogenetic variability of Nostocaceae Elenk. The studied Nostoc Vauch. strains have been divided into three main groups on the basis of the whole complex of their characters. One of the common features for the representatives of the family Nostocaceae is the formation of oblique or pseudo-longitudinal cell walls in young trichomes. It results in the appearance of zigzag or pseudobilined trichomes. Ibis character distinguishes Nostocaceae from the closely resembling Anabaena Bory species (Anabaenaceae Elenk.).