Microchaete sp. C

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

Microchaete sp. C . Fig. 65 A–F.

Filaments, epiphytic on filamentous algae, solitary or in small groups, flexuous, 5.3–6.2 μm wide, up to 200 μm long, attached to the substratum at the basal region. Sheath thin, colourless, not lamellated. Trichomes cylindrical along the entire length, constricted at the cross walls. Vegetative cells isodiametric up to 2 × longer than broad, 3.8–8.1 μm long × 3.7–5.6 μm wide; apical cells conically-rounded. Heterocytes basal and intercalary, basal heterocytes spherical to slightly conical, 3.6–6.8 μm long × 4.4–6.4 μm wide, intercalary heterocytes spherical. Akinetes not observed.

Specimens observed:—Einasleigh R. at Talaroo.

Observations:—Epiphytic, attached to filaments of Scytonema growing in shallow off stream waterholes. Compare with M. tenera ; much of the observed material often lacked a definite sheath.

Other species known from Australia: M. tenera var. tenuis, Running Ck , Queensland, A.B. Cribb, 1991 (BRI 0701260); M. grisea, Carlisle Is., Heron Is. , Queensland, A.B. Cribb, 1986, 1963 (BRI 0700728, BRI 0700729); M. vitiensis, Heron Is., Erskine Is. , Queensland, A.B. Cribb, 1963, 1970 (BRI 0700730, BRI 0701261).

RIVULARIA