Nodularia willei Gardner (1927)

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

Nodularia willei Gardner (1927) Fig. 18 A–E .

Filaments solitary amongst other algae or grouped into irregular clusters or mats, straight or slightly flexuous, 8.5– 12.0 μm broad. Trichomes cylindrical, slightly constricted at the cross walls, not attenuated towards the ends. Sheath fine, colourless, indistinct, open at both ends. Vegetative cells short barrel-shaped, always shorter than wide, 2.0–4.8 μm long × 8.2–11.5 μm broad, without aerotopes. Heterocytes intercalary, solitary, compressed, 4.5–6.0 μm long × 8.2–11.0 μm broad. Akinetes sub-spherical, compressed, solitary or commonly multiple in series, 5.5–8.3 μm long × 9.5–13.2 μm broad, with brownish granular contents.

Specimens examined:—Emu Ck at Grieves Rd, Marongi Ck at Turtle Ck Rd, Reedy Ck at Mt. Byron Rd, Running Ck at Biggenden Rd Crossing, Sandy Ck at Wivenhoe-Somerset Rd Crossing, Sheepstation Ck at Kilcoy-Murgon Rd, Wallaby Ck at Himstedts Rd.

Observations:— Growing on the benthos and amongst aquatic macrophytes and filamentous algae in shallow streams of the Mary and Brisbane catchments, south-east Queensland. A pantropical species, originally described from Central America. Australian material is consistent with the original description by Gardner (1927). Compare with N. moravica Hindák, Šmarda & Komárek 2003 which has similar morphology, but is known from wetlands in central Europe .

RAPHIDIOPSIS

Figures

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