Simple isopolar filaments lacking heterocytes and akinetes, with obvious constrictions between cells, partitioned into short segments of approx. 4-8 cells, which easily fragment from the filament. Fine mucilaginous sheath. Blue-green to yellow or brown.
Hormoscilla, X1000. Photo: Phil Novis, Manaaki WhenuaHormoscilla, X1000. Photo: Phil Novis, Manaaki Whenua
Typical habitats
We have few records, but possibly more common in clean waters.