Anabaena oscillarioides Bory de Saint-Vincent ex Bornet & Flahault (1886: 233)

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

Anabaena oscillarioides Bory de Saint-Vincent ex Bornet & Flahault (1886: 233) Fig. 36 C–D, G–H .

Filaments benthic, sometimes tycoplanktonic; trichomes solitary, straight or flexuous, cylindrical, distinctly constricted at the cross walls. Vegetative cells short barrel-shaped, ± isodiametric, 2.0–6.5 μm long × 4.0–5.5 (–6.5) μm broad, blue-green in colour; apical cells rounded or slightly conical. Heterocytes solitary, spherical to ovate, 5–10 μm long × 5–8 μm broad. Akinetes solitary, or up to two in series, cylindrical to oblong-ovate with rounded ends, (5–) 10–20 (–40) μm long × 6–10 μm broad, with a smooth, brownish-green exospore, adjacent to the heterocytes.

Specimens examined:—Atkinson Dam, Balonne R. near Brookdale, Balonne R. at Whenbah Bridge, Bill Gunn Dam, Bowen R. Weir, Burnett R. at Jones Weir, Burnett R. at Kirar Weir, Condamine R. at Chinchilla Weir Pondage, Condamine R. at Sunnyside, Cooper Ck at Tanbar Waterhole at Tanbar, Einasleigh R. at Talaroo, Fitzroy R. at Bingegang Weir, Lake Clarendon, Mary R. at Mary R. Barrage, Mary R. at Moy Pocket, Six Mile Ck at Bajool Weir, Tinaroo Falls Dam, Warrego R. at Red Waterhole at Binya, Yabba Ck at Bella Ck Rd.

Other records:— Queensland: Cribb (1986), SE Queensland, McLeod (1975), Grimes (1988); Victoria: Entwisle (1989), River Murray at Merbein, Murtho and Ross Lagoon, Baker (1991); New South Wales: Noble & Happey-Wood (1987), Playfair (1915, 1917), Namoi R. near Walgett, Baker (1991); South Australia: Strathalbyn Res., Bundaleer Res., Baroota Res., Baker (1991), River Murray at Wilkadene, Murtho Park, Humpage et al. (2013); Northern Territory: Scott & Prescott (1958), Ling & Tyler (2000).

Observations:—Typically known as a benthic species, however it has been reported as tycoplanktonic or in the plankton of weir pools, particularly in southern Australia ( Baker 1991).

Figures

FIGURE 36. A–B Anabaena cylindrica; C–D, G–H Anabaena oscillarioides; E–F Anabaena cf. augstumalis. Scale bars = 20 μm