Pycnacronema rubrum Martins et Branco

Da Anunciação, Raylane R., Paulino, Jonatas M., Moura, Ariadne N., Laughinghouse IV, H. Dail & 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 : 14

Pycnacronema rubrum Martins et Branco in Martins et al. (2019: 155) ( Fig. 10E–F ).

Trichomes solitary, unbranched, slightly constricted, not attenuated. Sheath absent. Cell isodiametric to sub-quadratic, 5.5–7.01 µm wide, 3.89–7.77 µm long, ratio l/w = 0.90. Apical cell rounded to conical-rounded, without calyptra or thickening. Cell content granulated, grayish-purple. With necridia.

Habitat:— Tree bark inside the forest; associated with Chroococcidiopsis sp.1 and Gloeocapsopsis sp.

Studied material:— PEUFR55801

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).