Planktothrix spiroides Wang and Li, 2013

Song, Ji-Ho, Kim, Do-Hyun, Lee, Nam-Ju, Kim, So-Won & Lee, Hye-Ryeung Wang and Ok-Min, 2022, Four newly recorded species of planktonic cyanobacteria (Oscillatoriales, Cyanobacteria) in Korea, Journal of Species Research 11 (4), pp. 321-329 : 325

Planktothrix spiroides Wang and Li, 2013 ( Fig. 3 )

Filaments solitary, floating, blue-green or olive green, rarely yellowish blue-green in color. Trichomes nonheterocystous, straight or slightly curved, regularly loose screw-like coils, become irregularly coiled with prolonged cultivation, attenuated or not attenuated towards ends, rarely motile, without false branching. Cross-walls rarely or not constricted, ungranulated. Mucilaginous sheaths rare. Apical cells rounded, slightly or not narrowing towards the apex, sometimes with calyptra. Cells cylindrical or rarely barrel-shaped, usually slightly shorter than wide, with gas vacuoles, 1.91-2.63 μm long, 3.97-6.14 μm wide. Reproduction by fragmentation into hormo- cytes.

Ecology. This species appeared in ponds ( Liu et al., 2013) and was isolated from brackish water in this study.

Distribution. China ( Liu et al., 2013).

Site of collection. 59, Dosam-ri, Maseo-myeon, Seocheon-gun , Chungcheongnam-do (36°01′22.4″N, 126°44′ 34.2″E) .

Date of collection. June 27, 2019.

Specimen deposit No. SJH-1.

Figures

Fig. 3. Microscopic photographs of Planktothrix spiroides SJH-1. (A, B) Arrangement of filament in the colony, (C-J) Apical cell of trichomes. Scale bars (A, B) 20 μm, (C-J) 10 μm.