Filamentous chlorophyte, usually unbranched but may be sparsely branched (cf. its close relative Cladophora, which is many-branched). Cells are large, long and cylindrical, each with a single, netlike green chloroplast with several pyrenoids.
Common in unshaded stony streams and rivers during summer low flows
![[Rhizoclonium], Auckland Botanic Gardens. Photo: Manaaki Whenua Image](/assets/Tools-And-Resources/Identification/algae/rhizoclonium3b__ScaleWidthWzEwMjRd.jpg)
![[Rhizoclonium], X640. Photo: Otago Regional Council & Manaaki Whenua Image](/assets/Tools-And-Resources/Identification/algae/rhizoclonium640__ScaleWidthWzEwMjRd.jpg)