Family: Colonial; cell body spherical with 2 or more pseudocilia (immobile); chloroplasts one, 2 or 3 in number, with or without pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Colonies pear-shaped or irregular bulbous in a gelatinous matrix; epiphytic on other algae by a narrowed stalk of the colony; cells evenly scattered at the periphery of the gel, each bearing a pair of long pseudocilia emerging outward (Photomicrographs of the Freshwater Algae, vol. 3, 1985). Colonies small, ovoid in shape, attached to other substrates at one end (Illustrations of The Japanese Fresh-water Algae, 1977).

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A. brauniana or Tetrasporidium ? cell 10 μm Sanda Hyogo, 2001	A. brauniana cell μm Kinu-gawa g.p. Takanezawa Tochigi, 2004	A. brauniana cell 8-10 μm pseudocilia visible Aquatic botanical g. Sawara Chiba, 2004	A. brauniana cell 8-10 μm pseudocilia visible Nagaike park Hachioji Tokyo, 2005
A. brauniana cell 8 μm Onnenai Kushiro marsh Hokkaido, 2005	A. brauniana cell 10-12 μm Univ. A.V.M. Obihiro Hokkaido, 2005	Apiocystis sp. cell μm Tsurugashima Saitama, 2003	A. brauniana ? cell 8-10 μm near Akai wetland Aizuwakamatsu Fukushima, 2005
A. brauniana cell 8 μm Kanayama c. Kiyose Tokyo, 2007

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