The genus Jaagichlorella Reisigl (Trebouxiophyceae, Chlorophyta) and its close relatives: an evolutionary puzzle Author Darienko, Tatyana University of Göttingen, Albrecht-von-Haller-Institute of Plant Sciences, Experimental Phycology and Sammlung für Algenkulturen, D- 37073 Göttingen, Germany & M. G. Kholodny Institute of Botany, National Academy Science of Ukraine, Kyiv 01601, Ukraine Author Pröschold, Thomas University of Innsbruck, Research Department for Limnology, A- 5310 Mondsee, Austria text Phytotaxa 2019 2019-01-14 388 1 47 68 http://dx.doi.org/10.11646/phytotaxa.388.1.2 journal article 10.11646/phytotaxa.388.1.2 1179-3163 13725500 Jaagichlorella geometrica Reisigl ( Fig. 6T –J‘) Emended description: Cells are solitary, spherical or slightly irregular. Young cells 3.6–4.2 μm in diameter, mature cells 6.0–8.0 μm. Chloroplast in young cells cup-shaped, in mature cells band-shaped removed from the cell wall, with a single pyrenoid surrounded by several starch grains. Reproduction by unequal sized autospores. Autosporangia between 6.0–10.0 μm in diameter, usually contain 4 autospores.SSU and ITS rDNA sequences (GenBank: MH780944) and ITS-2 Barcode BC- 6 in Fig. 3 . Lectotype (designated here): Fig. 25 in Reisigl (1964) . Epitype (designated here to support the lectotype ): The strain SAG 2549 is cryopreserved in a metabolic inactive state at the Culture Collection of Algae (SAG), University of Göttingen, Germany .