Scytonema javanicum Bornet ex Bornet et Flahault (1886: 95)

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 : 20

Scytonema javanicum Bornet ex Bornet et Flahault (1886: 95) ( Fig. 13D–E ).

Filaments solitary, 12.87–18.66 µm wide. Sheath firm, 1.11–3.85 µm wide, up to 2 lamellae, brown. Trichomes cylindrical false geminate or single branched, constricted. Apical cell rounded. Cells isodiametric to short, (7.51) 8.02– 13.74 µm wide, 5.11–10.75 µm long, ratio l/w = 0.74. Cell content granulated, blue-green. Heterocyte isodiametric to short, 8.92–15.29 µm wide, 4.01–9.43 µm long, in intercalary position. Necridia present. Without hormogonia.

Habitat: —Wet soil covered by moss.

Studied material: — PEUFR 55796

Figures

FIGURE 13. A–C. Scytonema guyanense; D–E. Scytonema javanicum; F–I. Scytonema schmidtii. False branch (arrow); J–L. Scytonema stuposum; M–O. Scytonemataceae sp. Scale: 50 μm (G); 10 μm (to the others).