Rhexinema sancta-tomea Darienko et Pröschold, 2017

Darienko, Tatyana & Pröschold, Thomas, 2017, Toward a monograph of non-marine Ulvophyceae using an integrative approach (Molecular phylogeny and systematics of terrestrial Ulvophyceae II.), Phytotaxa 324 (1), pp. 1-41 : 32

Rhexinema sancta-tomea Darienko et Pröschold sp. nov. ( Fig. 16F–G , 20A–G )

Diagnosis: Algae occurring as short 2–8-celled curved filaments, solitary or forming pseudofilaments of 2- celled packages held together by the remaining old cell walls. The cells are embedded in mucilage. Branching is very rudimentary and rare. The end cells of the rudimentary branches are ovoid or pear-shaped. Single cells are ovoid, oval or round with a diameter of 8.0–9.3 μm. Cells in packages are compressed from the sides, and have a diameter of 8.0–11.3 μm. End cells of rudimentary branches are 11.5 μm × 8.0 μm. Cells are uninucleate with parietal chloroplasts containing one good visible pyrenoid surrounded by several starch grains. Reproduction occurs by vegetative division. Zoospores are not observed.

Other species of Rhexinema differ by SSU-ITS sequences.

Habitat: Mud.

Type locality: São Tomé and Príncipe.

Holotype (designated here): The strain ACOI 592 is permanently cryopreserved in a metabolically inactive state (cryopreserved in liquid nitrogen) in the SAG, University of Göttingen , Germany.

ITS-2 DNA Barcode: RHE 5 in Figs S2.

Figures

FIGURE 16. Overview about the morphology of the investigated Rhexinema strains grown on MiEB12 medium. A. R. paucicellularis SAG 463-1, B. SAG 29.93, C. SAG 8.90, D. SAG 466-2; E. R. planctonica UTEX 1570, F,G. R. sancta-tomea ACOI 592.

FIGURE 20. Morphology of Rhexinema sancta-tomea ACOI 592 grown on MiEB12 medium.