Obliquicauda xianninga S.Y.Li & G.X.Liu, 2023

Li, Shu-Yin, Xu, Yuan-Zhao, Guo, Wen-Si, Zhu, Huan & Liu, Guo-Xiang, 2023, Obliquicauda longipens sp. nov. and Obliquicauda xianninga sp. nov.: two new species of foliicolous algae from China, Phytotaxa 626 (3), pp. 181-190 : 186-188

Obliquicauda xianninga S.Y.Li & G.X.Liu sp. nov. Figs. 3A–3J

Description: —Foliicolous, vegetative cells solitary, fusiform, slightly asymmetrical, without stalk or with a hardly found short stalk. Young cells narrow and elongated, 10.2–13.7 μm long and 3.6–4.0 μm wide, L:W ratio 3.3–3.7. Chloroplasts single, parietal, plate- or saucer-shaped and an inconspicuous pyrenoid. Mature cells much broader, 11.6– 15.9 μm long and 3.6–8.0 μm wide, L:W ratio 1.6–3.4. Most cells have no stalks, and several cells have short stalks of less than 2 μm. Chloroplasts single, parietal, saucer-shaped, with slightly waved margins and a pyrenoid surrounded by starch grains. Multiple chloroplasts transitorily exist during development of autospores due to chloroplast fission before spore cell wall formation. Asexual reproduction by release of 2 or 4 autospores after splitting of the mother cell wall. Sexual reproduction not observed. Representative DNA-sequences: 18S, OR492007; rbc L, OR493441.

Reference strain: —A living culture was deposited in the Freshwater Algae Culture Collection, Institute of Hydrobiology, Chinese Academy of Science, Wuhan, China (FACHB) as strain FACHB-2471.

Holotype: —Deposited as G179 (formaldehyde-fixed algal fluids) in the Freshwater Algal Herbarium ( HBI), Institute of Hydrobiology , Chinese Academy of Science, Wuhan, Hubei Province, China.

Type locality: — Xianning city (29°24'39.84"N, 114°35'23.41"E), Hubei Province, China; collected from a living Ficus pumila leaf in April 2019 .

Etymology: —The species was named for the geographic origin (Xianning) of the holotype.

Figures

FIGURE 3. Light photomicrographs of O. xianninga S.Y.Li & G.X. Liu sp.nov.strain FACHB-2471.A: Cultured colony in the laboratory. B–F: Details of cells from young to mature. G–J: Details of autospores and released spores. Scale bars: 10 μm.