Stigonema fremyi

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 : 22

Stigonema fremyi Sant’Anna, Kaštovský, Hentschke & Komárek (2013: 8) ( Fig. 14G–I ).

Filaments multiseriate, erect, 19.15–37.89 µm wide. Filaments and branches not clearly distinguishable, 1–3 cells in apical portion. Sheath firm, non-lamellated, brown. Cells round to elongated in young filaments and round in mature filaments 5.16–18.65 µm wide. Cell content granulated, blue-green. Heterocyte spherical, semi-spherical, lateral to intercalary position, 7.69–11.16 µm wide. Hormogonia numerous, developed in the apical branches.

Habitat: —Rock fully exposed to the sun; associated with Scytonema shmidtii , Microcoleus vaginatus and Hassallia aff. andreassenii .

Studied material: — PEUFR 55772

Figures

FIGURE 14. A–C. Scytonemataceae sp.; D–F. Stigonema corticola; G–I. Stigonema fremyi; J–N. Stigonema minutum. O–S. Mastigocladopsis sp.—O. details of the arrangement of the filaments; P. Apical cell; Q. Akinete; E–F. the filament details. Scale: 50 μm (D; G; J; O); 10 μm (to the others).