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Cyanophyceae: Nostocales: Rivulariaceae

 Calothrix marchia
Lemmermann

Family: Trichome (filamentous structure) tapered from base to tail
Genus: Heterocysts present; one trichome within a sheath; coenobium absent (Illustrations of The Japanese Fresh-water Algae, 1977).

Calothrix marchia Lemmermann ?, cell body μm long, μm wide, x 640, rice field, Senuki, Takaku-kou, Nasu town, Tochigi Pref., Japan, October 31, 2004 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Calothrix Calothrix Calothrix Calothrix Calothrix Calothrix

Homoeothrix: Heterocysts absent (Illustrations of The Japanese Fresh-water Algae, 1977).

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