Microchaete tenera Thuret ex Bornet & Flahault (1886: 84)

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

Microchaete tenera Thuret ex Bornet & Flahault (1886: 84) Fig. 63 A–F.

Filaments solitary or in small groups, flexuous, 6.0–7.5 (–8.5) μm wide, attached to the substratum along the basal region. Sheath thin, colourless, not lamellated. Trichomes cylindrical along the entire length, not or slightly constricted at the cross walls. Vegetative cells isodiametric up to 2 × longer than broad, 5.5–10.5 μm long × 4.5–5.5 (–6.9) μm wide; apical cells conically-rounded. Heterocytes basal and intercalary, basal heterocytes spherical to slightly conical, 6.0–9.0 μm long × 5.0–7.5 μm wide, intercalary heterocytes cylindrical, up to 4 × longer than broad, 10.0 –21.5 μm long × 5.0–6.5 μm wide. Akinetes not observed.

Specimens observed:—Fat Hen Ck at Kilkivan.

Other records:— Queensland: SE Queensland, McLeod (1975); New South Wales: Pond on the Broadway side of Victoria Park at Chippendale, S. Skinner, 2002 ( NSW 910368 ) ; Victoria: Darling (1982).

Observations:—Epiphytic, growing attached to filaments of Lyngbya and intermixed with other filamentous algae and aquatic vegetation, in the shallows of a small subtropical stream.