Dapisostemon sp.

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

Dapisostemon sp. ( Fig. 10L–N ).

Filaments in fascicles, erect, forming black mats, 8.65–12.62 µm wide. Trichomes cylindrical, with tolypothricoid branching in the apical portion, constricted only in apical portion. Sheath firm, 0.4–2.2 µm wide, non-lamellated, hyaline to brown. Cells isodiametric to sub-quadratic, 6.32–10.27 µm wide, 4.14–10.15 µm long, ratio l/w = 0.93. Cell content granulated, blue-green. Basal heterocyte semielliptical or elliptical to short when intercalary, 6.74–9,13 µm wide, 4.89–10.14 µm long. Necridia present.

Habitat: —Tree bark; associated with Gloeocapsa sp.1 , Stigonema corticola , and Gloeocapsopsis sp.

Notes: —This morphotype differs from Dapisostemon apicaliramis Hentschke , Sant’Anna et Johansen by its filament width, sheath without lamellae, cell content and habitat.

Studied material: — PEUFR 55774, PEUFR 55781

Nostocaceae Eichler (1886: 7) .

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).