Heteroscytonema G.B. McGregor & Sendall (2018: 15)

Mcgregor, Glenn B., 2018, Freshwater Cyanobacteria of North-Eastern Australia: 3. Nostocales, Phytotaxa 359 (1), pp. 448-450 : 448-450

Heteroscytonema G.B. McGregor & Sendall (2018: 15)

Type: H. crispum (Bornet ex De Toni) G.B. McGregor & Sendall (2018: 15)

Filamentous, solitary, or many together forming a caespitose, woolly thallus, olive-green to blackish green in colour. Filaments straight to variously flexuous,sometimes slightly coiled, cylindrical, with solitary or geminate false-branching, initiated following the formation of necridic cells; sheath firm, lamellated, with a smooth exterior surface, colourless or yellowish-brown in mature filaments. Trichomes isopolar, not or slightly constricted at the cross walls. Vegetative cells discoid to short barrel-shaped, blue-green in colour; apical cells widely rounded. Heterocytes intercalary, discoid to subspherical, single or up to two in series. Reproduction by hormogonia, which develop at the ends of branches and liberate from the sheaths. Akinetes absent. Bibliography: Sendall & McGregor (2018)