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Sirogonium (Zygnemataceae)

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Diagnostic features

Unbranched filamentous zygnematalean with cylindrical cells, each of which has two or more linear or slightly twisted, ribbon-like green chloroplasts containing pyrenoids.  Chloroplasts strongly resemble those of Spirogyra (a close relative), but are not spiralled. Conjugation also differs from that in Spirogyra, by lacking conjugation tubes.

[Sirogonium], X100. Photo: Phil Novis, Manaaki Whenua Image
Sirogonium, X100. Photo: Phil Novis, Manaaki Whenua
[Sirogonium], X200. Photo: Phil Novis, Manaaki Whenua Image
Sirogonium, X200. Photo: Phil Novis, Manaaki Whenua

Typical habitats

The specimen photographed was from a clean water site

Classification

Kingdom Plantae
Phylum Charophyta
Class Zygnemophyceae
Order Zygnematales
Family Zygnemataceae
Common name Green algae