FIGURE 1. A–J in Spelaeonaias gen. nov., a new true-branched cyanobacterium from Cave Vlychada (Diros, Peloponnese, Greece)

FIGURE 1. A–J. LM and SEM micrographs of Spelaeonaias floccida. A. Filaments of Spelaeonaias floccida showing the main filament and the secondary branches. B. Division of an initial cell, giving rise to two cells that change division polarity for the formation of a secondary branch. C. Secondary filament with a necridic cell (nc). D–G. Main and secondary filaments with the characteristic Y-type of branching; heterocytes at arrows. H. Hormogonia with an intercalary heterocyte at arrow. I. A single hormogonium with a terminal heterocyte (arrow). J. Single hormogonium as seen under SEM; the heterocyte (arrow) in a secondary filament is also obvious. Figs A–B from fresh material. Figs C–J from cultures. Scale bars = 10 μm (A–D, F, H, I) and 20 μm (Ε, G, J).