Brasilonema ornatum

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 : 18

Brasilonema ornatum C.L. Sant’Anna et J. Komárek in Sant’Anna et al. (2011:54) ( Fig. 11M–O ).

Filaments forming fascicles conical, erect and parallel, 10.63–26.19 µm wide. Sheath firm, thickened, 1–3 lamellae, regularly ornamented, hyaline to slight brown. Trichomes cylindrical, false geminate branched, constricted. Cell short, 8.7–14.57 µm wide, 4.09–9.47 µm long, ratio l/w = 0.57. Apical cell rounded. Cell content granulated, olive-green, pale purple or brown. Heterocyte cylindrical or ellipsoidal, intercalary, 5.52–15.65 µm wide, 9.33–15.48 µm long. Hormogonia 5–10 cells, constricted, with basal heterocyte or not.

Habitat: —Tree root on the trail.

Studied material: — PEUFR 55813

Figures

FIGURE 11. A–C. Komarekiella sp.—different stages of the life cycle. D–H. Nostoc interbryum—different stages of the life cycle; D. specimens from field samples; E–H. specimens from cultured strains; F. the filament inside the colonies with individual sheath (arrows); G. heterocyte (arrows). I–L. Brasilonema epidendron; M–O Brasilonema ornatum. Scale bar: 100 μm (E); 50 μm (J); 10 μm (to the others).