Nodularia harveyana Thuret ex Bornet & Flahault (1886: 243)

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

Nodularia harveyana Thuret ex Bornet & Flahault (1886: 243) Fig. 18 F–I .

Filaments solitary or forming fine mats on the substratum, straight or flexuous 4–6 μm wide. Trichomes cylindrical, slightly constricted at the cross walls, not attenuated towards the ends; sheath fine, colourless, diffluent. Vegetative cells shortly barrel-shaped, always shorter than broad, 1.5–2.8 μm long × 4.0–5.5 μm wide, without aerotopes. Heterocytes barrel-shaped to rectangular-rounded, 3–5 (–8) μm long × 4–6 (–9) μm wide. Akinetes compressed sub-spherical to almost spherical, 4–8 μm long × 6–7 μm wide, single or multiple in series.

Specimens examined:—Home Beach Swamp, North Stradbroke Is., L. Cathie, Port Macquarie.

Other records:— Queensland: Mt Alford, A.B. Cribb 1976 (BRI 0701382), Bribie Is., A.B. Cribb 1975 (BRI 0701383), Dunwich, North Stradbroke Is., R.L. Specht 1974 (BRI 0701384).

Observations:—Cosmopolitan. Benthic or periphytic species, typically found growing in sandy substratum in the estuarine reaches of rivers and streams, or inland saline/brackish water bodies. Observed from shallow groundwater fed coastal wetlands, located behind frontal dunes, which receive periodic seawater inundation.

Figures

FIGURE 18. A–E Nodularia willei; F–I Nodularia harveyana. Scale bars = 20 μm