Pachycladella umbrina (G.M. Smith) Silva

Kim, Yong Jae, 2017, New records of coccoid green algae in Korea, Journal of Species Research 6 (1), pp. 42-50 : 47

Pachycladella umbrina (G.M. Smith) Silva ( Fig. 3h, i )

References: Komárek and Fott 1983: 270, pl. 80, fig. 3; Reymond and Hegewald 1990: figs. 1-27; Silva 1970: 943; Smith 1950: 258, fig. 172; Shubert 2003: 292, fig. 19E.

Basionym: Pachycladon umbrinus Smith 1924 .

Synonym: Treubaria umbrina (Smith) Fott and Kovacik. Occurrence site: Chukdong reservoir and fishery (WT 28.3℃, pH 8.3. EC 213 μs/cm).

Description: This species is unicellular and solitary, has a spherical cell shape enclosed by a thin wall lacking a gelatinous envelope. The cell walls have four stout radiating appendages, tapering to blunt or bifurcated apices. The bases of the appendages are situated roughly in one plane. A chloroplast is located in the center of each cell, and contains a pyrenoid. The cells are 7-13 μm in diameter and the appendages are 20-50 μm in length.

Distribution: New York, North Carolina and Kentucky in USA ( Smith, 1950), Austria, Ukraine and Hungary ( Komárek and Fott, 1983), Bangladesh ( Islam and Alfasane, 2005).

Specimen: NIBRCL0000112295; DAEJIN-20150603-6

Remark: The genus Pachycladon was originally described from Palisades Interstate Park in New York by Smith (1924). Smith (1924) described Pachycladon umbrinus as a new species, but Silva (1970) renamed the genus Pachycladon to the new genus Pachycladella , and merged Pachycladon umbrius into Pachycladella umbrina as a basionym. Fott and Kovacik (1975) includ- ed P. umbrina into Treubaria umbrina as a synonym. Treubaria umbrina has similarities to the genus Treubaria , but differs in cell shape, the nature of the appendages, and the chloroplast ( Smith, 1950). Therefore, it is classified as Pachycladella umbrina because there is no controversy with respect to the differences between the two genera.

Figures

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