Calothrix sp. D

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

Calothrix sp. D Fig. 56 C–F .

Filaments in a dense, olive-green coloured turf. Filaments attached to the substrate, erect, straight to slightly flexuous, up to 2 mm in length, 14–25 μm wide at the base. Sheaths firm, widened, not coloured, or stratified, up to 5 μm wide, open at the ends. Trichomes blue- to olive-green in colour, slightly constricted at the cross walls, continuously narrowed towards the end, but not ending in a hair-like cell. Vegetative cells distinctly shorter than broad, 3.5–4.6 μm long × 11.2–13.5 μm wide. Heterocytes solitary, basal 7.1–21.3 μm long × 14.2–21.3 μm wide, intercalary, 8.5–16.3 μm long × 9.8–16.0 μm wide.

Specimens observed:—South Pine R. at Carter Court.

Observations:—Growing as a dense turf attached to large boulders and woody debris in the shallows of a subtropical river in SE Queensland.

Other species known from Australia: C. castellii Bornet & Flahault (1886: 369) , Ling & Tyler (2000).

CAMPTYLONEMOPSIS

Figures

FIGURE 56. A–B Calothrix atricha; C–F Calothrix sp. D. Scale bars A–E = 20 μm, F = 50 μm