Scytonema schmidtii Gomont (1901: 210)

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 : 21-22

Scytonema schmidtii Gomont (1901: 210) ( Fig. 13F–I ).

Filaments entangled on substrata or solitary, 16.17–28.81 µm wide. Sheath firm, 1.3–3.93 µm wide, slight lamellated, intensity striate, yellowish-brown to intense brown. Trichomes cylindrical, false geminate branched, constricted.Apical cell rounded. Cell sub-quadratic to short, 10.69–24.21 µm wide, 3.19–9.78 µm long, ratio l/w = 0.47. Cell content homogenous, blue-green. Heterocyte elliptical to short, 12.56–18.87 µm wide, 5.73–11.48 µm long, in intercalary position. Hormogonia 6–14 cells, constricted, with intercalary heterocyte or not.

Habitat: —Rock fully exposed to the sun; associated with Gloeocapsa novacekii , Gloeocapsopsis dvorakii , Stigonema fremyi , Microcoleus vaginatus and Hassallia aff. andreassenii .

Studied material: — PEUFR 55769, PEUFR 55772

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).