Paulbroadya petersii 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 : 15-17

Paulbroadya petersii Darienko et Pröschold sp. nov. ( Fig. 8A–G )

Diagnosis: The thalli of mature plants are cushion-shaped, composed from prostrate and branched filaments, with a maximum length of 2–3 mm. The prostrate system is formed of square cells that are often gathered into cell packages with cell size of 5.2–5.5–6.8 μm. The erect system is richly branched uni- or bilateral. Intercalary cells of erected filaments 5.5–10.5 μm long × 5.2–6.8 μm, up to twice as long as broad. Terminal cells are slightly pointed, 14.5–21.2 μm long × 4.8–5.2 μm wide, and are twice to four times as long as broad. Cells are uninucleate, with parietal plate-like chloroplast and one pyrenoid. The pyrenoid is surrounded by starch grains. Asexual reproduction occurs by formation of zoospores. Zoosporangia are pear-shaped and usually produced in the prostrate system of filaments. Zoosporangia 11.2–21.2 μm long × 5.5–8.1 μm wide. Zoospores are released by rupture of sporangia on the broad side of sporangia. Zoospores are quadriflagellated, very small (4.5–5.0 × 3.7–4.0 μm), with an anterior stigma.

The species differs from similar species by SSU-ITS sequences.

Habitat: Symbiont of Verrucaria mucosa .

Type locality: Roscoff, Brittany, France.

Holotype (designated herein): The authentic strain SAG 2240 is permanently cryopreserved in a metabolically inactive state (cryopreserved in liquid nitrogen) in the SAG, University of Göttingen , Germany.

Iconotype (designated herein to support of the holotype): Fig. 8 in this study.

Etymology: The species named in the honor of Dr. Akira Peters, who provide us the strains of Verrucaria photobionts.

Comment: This species is distributed at least in the cold water of the North Atlantic as photobiont of Verrucaria mucosa : SAG 2240 - Roscoff, Brittany, France and ULVO-34 - Oban, Scotland.

ITS-2 DNA Barcode: PAU 1 in Figs S2 (barcode is identical with P. prostrata , but differ in SSU rDNA sequences).

Figures

FIGURE 8. Morphology of Paulbroadya petersii SAG 2240 grown on SWES medium. A, B. general view of plants, C–G. morphology of filaments in two-weeks of growth.