Obliquicauda longipens 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

Obliquicauda longipens S.Y.Li & G.X.Liu sp. nov. Figs. 2A–2L

Description: —Foliicolous, vegetative cells fusiform, asymmetrical, with a long stalk tilting to one side, solitary or temporary clustered. Young cells narrow and elongated, 14.9–17.4 μm long and 3.7–5.7 μm wide, L:W ratio 3.0–3.4. Stalks 4.9–8.1 μm long. Mature cells much broader, 15.1–20.1 μm long and 4.3–10.4 μm wide, L:W ratio 1.8–3.0. Stalks are 4.9–8.7 μm long. Chloroplasts single, parietal, saucer-shaped, with slightly waved margins and a pyrenoid surrounded by starch grains. Asexual reproduction by release of 2 autospores after splitting of the mother cell wall. Released cells may temporarily cluster by the connection of stalk or residual mother cell wall. Sexual reproduction not observed. Representative DNA-sequences: 18S, OR492006; rbc L, OR493440.

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-2467.

Holotype: —Deposited as G127 (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 name longipens refers to the vegetative cells of this species that always have a long stalk. Longa is from the Latin, meaning long; penis is from the Latin for stalk.

Figures

FIGURE 2. Light photomicrographs of O. longipens S.Y. Li & G.X. Liu sp.nov.strain FACHB-2467.A: Cultured colony in the laboratory. B–I: Details of cells from young to mature. J–L: Details of autospores and released spores. Scale bars: 10 μm.