Vischerioclonium submersum 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 : 36-37

Vischerioclonium submersum Darienko et Pröschold sp. nov. ( Fig. 23A–F )

Synonym: Pseudendoclonium basiliense var. brandii sensu Tupa 1974 , non Pseudendoclonium basiliense var. brandii sensu Vischer 1933 .

Diagnosis: (after Tupa 1974) Thalli are small, 100–200 (up to 300) μm in diameter, and branched. The thallus consists of prostrate and erected systems of filaments. Branches of erected system consist 5–15 cells. Young cells are 4.0–5.0 μm wide × 10.0–20.0 μm long. Terminal cells can reach up to 30 μm and are tapered. Vegetative cells are uninucleate and contain parietal chloroplasts with a pyrenoid surrounded by starch grains. Old cells are barrel-shaped to spherical, 8.0–10.0 μm in diameter. Erected filaments in old culture become pluriseriate or form packet-like structures.

Reproduction occurs via zoospores and akinetes, or by thallus fragmentation. Zoospores are 6.0–7.0 μm × 3.5–4.5 μm, have an anterior stigma and cell nucleus, and are quadriflagellated. Zoosporangia are 6.0–12 μm in diameter and usually contain 4–8 daughter cells. Akinetes reach 20 μm in diameter. Sexual reproduction is not observed.

Holotype (designated herein): The strain UTEX 1913 is permanently cryopreserved in a metabolically inactive state (cryopreserved in liquid nitrogen) in the SAG, University of Göttingen , Germany.

Iconotype (designated herein in support of the holotype): Fig. 110 in Tupa (1974).

ITS-2 DNA Barcode: VIS 1 in Figs S2.

Figures

FIGURE 23. Morphology of Vischerioclonium submersum UTEX 1913 grown on 3NBBM medium.