Microchaete cf. investiens Frémy (1930: 283)

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

Microchaete cf. investiens Frémy (1930: 283) Fig. 62 A–E.

Filaments solitary or in small groups, straight or slightly flexuous, 7.7–10.4 μm wide, initially attached to the substrate along its entire length, later only at the base, with the apical ends free. Trichomes cylindrical along the entire length, clearly constricted at the cross walls, brownish-green in colour. Sheath fine, not lamellated, colourless, open at the ends. Vegetative cells isodiametric to 2 × longer than broad, 7.8–11.0 μm long × 5.1–7.0 μm wide; apical cell conically rounded. Heterocytes solitary, basal spherical, 6.8–7.5 μm in diameter, intercalary cylindrical, 11.0–12.5 μm long × 7.1–11.2 μm wide. Akinetes not observed.

Specimens observed:—Little Yabba Ck, Maleny Kenilworth Rd Crossing.

Observations:—Growing attached to filaments of Microseira wollei and Scytonema in the littoral zone of a small, coastal stream. M. investiens is known from tropical areas, usually epiphytic on filamentous algae and aquatic plants; material from SE Queensland was slighty wider than previously reported for this species.