Dolichospermum crassum (Lemmermann) Wacklin, Hoffmann & Komárek (2009: 61)

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

Dolichospermum crassum (Lemmermann) Wacklin, Hoffmann & Komárek (2009: 61) Fig. 11 A–E.

Basionym: Anabaena spiroides var. crassa Lemmermann (1898: 155)

Filaments solitary, planktonic; trichomes regularly screw-like coiled, coils 40–90 μm in diameter, constricted at the cross walls, not attenuated towards the ends; often with a broad, colourless mucilage. Vegetative cells globose, compressed at the poles, dark blue-green in colour, with aerotopes, 8.0–12.0 μm in diameter; apical cells undifferentiated. Heterocytes spherical or slightly compressed at the poles, 9.0–15.0 μm in diameter. Akinetes intercalary, solitary or in pairs, oval to cylindrical, slightly curved and remote from the heterocytes, 14.0–40.0 μm long × 13.5–25.0 μm broad.

Specimens examined:—Atkinson Dam, Bill Gunn Dam, Fitzroy R. at Eden Bann Weir, Haughton R. at Giru Weir, Lake Clarendon, Paradise Dam.

Other records:— Queensland: Indooroopilly, McLeod (1975); New South Wales: River Murray at Murtho, Murbko, Swan Reach, Mannum, Wood’s Point, Hawkesbury R. near Sackville, Baker (1991), Hume Dam, Humpage et al. (2013); South Australia: Lake Alexandrina at Goolwa, Baker (1991), Gumeracha Weir-River Torrens, Farm dam at Angaston, Baker (1991); Victoria: Wonthaggi-Inverloch Res., Green L., Dock L., Baker (1991), Ling & Tyler (2000); Northern Territory: Kangaroo Ck, Humpage et al. (2013).

Observations:—Uncommon, recorded from Europe, Asia, South America and New Zealand. Australian populations reported from mesotrophic dams and weir pools.

Dolichospermum flosaquae (Brébisson ex Bornet & Flahault) Wacklin, Hoffmann & Komárek (2009: 60) Fig. 12 A–D.

Basionym: Anabaena flosaquae Brébisson ex Bornet & Flauhault (1886: 228)

Filaments solitary or entangled into small clusters, planktonic; trichomes irregularly screw-like coiled and twisted, constricted at the cross walls, not attenuated towards the ends; often associated with an indistinct, colourless mucilage. Vegetative cells spherical and compressed at the poles, (3.0–) 4.0–5.5 μm in diameter, blue-green in colour, with aerotopes; apical cells undifferentiated. Heterocytes spherical 5.0–10.0 μm in diameter. Akinetes intercalary, solitary or in pairs, cylindrical reniform, remote from the heterocytes, 15.0–24.0 μm long × (4.0–) 7.0–14.0 μm broad.

Specimens examined:—Atkinson Dam, Beardmore Dam, Fitzroy R. at Bedford Weir, Fitzroy R. at Eden Bann Weir, Fitzroy R. at Glebe Weir, Fitzroy R. at Moura Weir, Fitzroy R. at Neville Hewitt Weir, Fitzroy R. at Theodore Weir, Fitzroy R. at Bingegang Weir, Burnett R. at Ben Anderson Barrage, Burnett R. at Charles Lloyd Jones Weir, Burnett R. at Claude Wharton Weir, Burnett R. at Jones Weir, Burnett R. at Kirar Weir, Burnett R. at Ned Churchward Weir, Bill Gunn Dam, Bjelke-Petersen Dam, Boondooma Dam, Borumba Dam, Bowen R. at Bowen R. Weir, Kolan R. at Bucca Weir, Burdekin Falls Dam, Callide Dam, Cania Dam, Coolmunda Dam, Corella Dam, Pioneer R. at Dumbleton Weir, Pioneer R. at Marian Weir, Pioneer R. at Mirani Weir, Eungella Dam, Fairbairn Dam, Fred Haigh Dam, Gattonvale offstream storage, Haughton R. at Giru Weir, Glenlyon Dam, Julius Dam, Kinchant Dam, Lake Clarendon, Leslie Dam, Maroon Dam, Mary R. at Mary R. Barrage, Moogerah Dam, Moura offstream storage, Paradise Dam, Peter Faust Dam, Fitzroy R. at Tartrus Weir, Teemburra Dam, Tinaroo Falls Dam, Warrego R. at Thurulgoona, Wuruma Dam.

Other records:— Queensland: SE Queensland, McLeod (1975); New South Wales: Lake Victoria, Baker (1991), Namoi R. near Walgett, Baker (1991); Victoria: River Murray at Bonyarical Ck, Baker (1991), Yan Yean Res., Hardy (1907), Dartmouth Dam, Powling (1980); South Australia: River Murray at Waikerie, Murbko, Swan Reach, Punyelroo, Baker (1991), Ling & Tyler (2000); Western Australia: Vasse R., Lee et al. (2014); Northern Territory:Alligator Rivers region, Ling & Tyler (1986).

Observations:—Cosmopolitan. Widespread and common throughout Australia where it sometimes forms blooms in mesotrophic reservoirs and farm dams. Australian populations have not been associated with the production of cyanotoxins.