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Cyanophyceae: Chroococcales: Chroococcaceae
Cyanophyceae: Chroococcales: Merismopediaceae

 Pannus sp.

Order & Family: Floating unicells or a colony embedded in a matrix; no differentiation of apical and base structures; only one family.
Genus: Colonies consiting of orderly arranged cells; diameter of cells at transverse section is the same as its length (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:

Pannus sp. ?, cell body spherical, 3.5 μm in diam., x 100, x 200, x 400, x 640, wetland, Okubo Ryoke, Akigase park, Saitama city, Saitama Pref., Japan, August 8, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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