Siderocystopsis fusca (Korshikov) Swale

Kim, Yong Jae, 2017, New records of coccoid green algae in Korea, Journal of Species Research 6 (1), pp. 42-50 : 45

Siderocystopsis fusca (Korshikov) Swale ( Fig. 3a, b )

References: Hindak 1977: 60, pl. 25, figs. 1-10; Komárek and Fott 1983: 336, pl. 101, fig. 4.

Synonym: Sidercystis fusca Korshikov.

Occurrence site: Chukdong reservoir (WT 28.3℃, pH 8.3. EC 213 μs/cm).

Description: This species is unicellular and solitary, with oval or widely oval shape. Cell walls granulated on the surface as spine base and with numerous fine spines on the surface. A chloroplast is located in the center of each cell, and contains a pyrenoid. The cells are 6- 10 0e in length and 4- 8 4e in width.

Distribution: Slovakia ( Hindak, 1977), England, Polend, Russia ( Komárek and Fott, 1983).

Specimen: NIBRCL0000112294; DAEJIN-20150603-4.

Remark: This species has similarities with the genus Franceia , which has several fine spines on the cell surface, but it differs in having a granulated cell wall surface. The genus Siderocystopsis also differs from the genus Siderocelis both by the presence of numerous fine and long spines, and by the presence of unique fine spines at the periphery of parts of the cell wall of the mother cell, following the release of autospores ( Hindak, 1977).

Sidercoystis fusca was described by Korshikov (1953) and placed in the family Oocystaceae . Swale (1964) replaced the invalid genus name Siderocystis by Siderocystopsis , and Ettl and Komárek (1982) transferred the alga to the family Micractiniaceae . The bristles and cell wall structure of Siderocystopsis are different from Micractinium that Siderocystopsis were not due to a cell wall structure having intersecting cellulose fibrils, and in older cells having two chloroplasts each containing a single pyrenoidg. (Hegewald and Schnepf, 1984). The description of Golenkinia punctifera by Bolochonzew (1903) is similar to the description and illustration of Siderocystopsis fusca . However, Hegewald and Schnepf (1984) merged G. punctifera into Siderocystopsis punctifera as a basionym. Guiry and Guiry (2016) noted that this species is currently regarded as S. punctifera . It is need to rearrangement from S. fusca to S. punctifera .

Figures

Fig. 3. a, b. Siderocystopsis fusca, c, d. Siderocelis oblonga, e-g. Siderocelis estheriana, h, i. Pachycladella umbrina. Scale bar is 10 μm.