Nostoc interbryum

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

Nostoc interbryum Sant’Anna et al. (2007: 96) ( Fig. 11D–H ).

Colonies macroscopically blackish, round to elongated, or amorphous microscopic colonies, 30.06–87.54 μm wide. Trichomes moniliform, densely to sparsely arranged in colonies, flexuous, not branched. Sheath conspicuous, firm, non-lamellated, hyaline to brown. Cells spherical or sub-quadratic, 2.19–9.86 µm wide. Apical cell rounded. Cell content homogenous or slight granulated, blue-green. Heterocyte spherical, semielliptical (2.84) 3.55–5.69 µm wide, brown, basal or intercalary position. Akinetes spherical or irregular in mature colonies, 4.11–5.69 μm diam.

Habitat: —Tree bark; associated with Hassallia sp. and Gloeocapsa sp.2 .

Studied material: — PEUFR 55785, PEUFR 55786, PEUFR 55797, PEUFR 56647

Family Scytonemataceae Rabenhorst ex Bornet et Flahault (1886: 81) .

Brasilonema epidendron C.L. Sant’Anna et J. Komárek in Sant’Anna et al. (2011:52) ( Fig. 11I–L ).

Filaments forming fascicles conical, erect and parallel, 9.17–13.69 µm wide. Sheath firm, (0.62) 1.02–2.06 µm wide, non-lamellated, hyaline to brown. Trichomes with false geminate branches near substrate, constricted or not. Cells isodiametric to cylindrical, 6.67–10.9 µm wide, 4.52–9.79 µm long, ratio l/w = 0.82. Apical cells rounded. Cell content granulated, blue-green. Heterocyte cylindrical, isodiametric to short, 7.67–11.17 µm wide, 5.67–15.95 µm long. Necridia present. Hormogonia 5–13 cells, slightly constricted.

Habitat: —Epiphytic on moss on rocks.

Studied material:— PEUFR 55765

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).