Porphyrosiphon kaernbachii (Hennings) De Toni (1892: 134)

Da Anunciação, Raylane R., Paulino, Jonatas M., Moura, Ariadne N., Iv, H. Dail Laughinghouse & Gama, Watson A., 2024, Morphometric Characterization And The First Taxonomic Synthesis Of Terrestrial Cyanobacteria From The Atlantic Forest In Northeastern Brazil, Phytotaxa 646 (1), pp. 1-31 : 16

Porphyrosiphon kaernbachii (Hennings) De Toni (1892: 134) ( Fig. 10J ).

Basonym: Scytonema kaernbachii Hennings (1892: 8) .

Filaments solitary or in groups, flexuous, irregularly arranged on substrata, (5.28) 7.46–13.27 µm wide. Trichomes cylindrical, slight constricted. Sheath absent or firm, smooth, no lamellae or slight lamellated, hyaline to reddish-brown. Cells isodiametric to short, 8.98–13.03 µm wide, (3.25) 3.76–12.69 µm long, ratio l/w = 0.66. Apical cell conical or rounded-conical, without calyptra or thickening. Cell content granulated, blue-green. Necridia present.

Habitat:— Tree bark.

Studied material:— PEUFR 55792

Family Oscillatoriaceae Engler (1898: 6) .

Lyngbya ocreata Gardner (1927: 39) ( Fig. 10K ).

Filaments solitary, 6.42–9.7 µm wide. Trichomes cylindrical, not constricted. Sheath firm, smooth, 0.9–1.5 µm wide, up to 3 lamellae, hyaline to yellowish-brown. Cells short, 4.28–7.57 µm wide, 0.84–2.73 µm long, ratio l/w = 0.26. Apical cell rounded to rounded-conical, without calyptra or thickening. Cell content granulated, bright green. Necridia present.

Habitat: —Wet soil; associated with Aphanothece pallida and Gloeothece samoensis .

Studied material: — PEUFR 55794

Nostocales Borzì (1914: 352) .

Family Dapisostemonaceae Hentschke, Sant’Anna et Johansen (2016: 136) .

Figures

FIGURE 10. A–B. Chroococcidiopsis sp.1; C–D. Chroococcidiopsis sp.2; E–F. Pycnacronema rubrum; G. Microcoleus vaginatus; H–I. Porphyrosiphon ceylanicus; J. Porphyrosiphon kaernbachii; K. Lyngbya ocreata; L–N. Dapisostemon sp.; O–R. Komarekiella sp.— different stages of the life cycle. Scale bar: 50 μm (L); 10 μm (to the others).