Fottea X:X | DOI: 10.5507/fot.2025.004

Streptosarcina costaricana var. goloustica var. nov. (Klebsormidiophyceae, Charophyta) from soils of Baikal mountains, Russia

Irina N. Egorova1, Nina V. Kulakova1*, Olga N. Boldina2
1 Siberian Institute of Plant Physiology and Biochemistry of the Siberian Branch of the Russian Academy of Sciences, Lermontova str. 132, 664033 Irkutsk, Russia, *Corresponding author e-mail: kulakova@sifibr.irk.ru
2 Komarov Botanical Institute of the Russian Academy of Sciences, Prof. Popov str. 2, 197022 Saint-Petersburg, Russia

The charophyte algae of the genus Streptosarcina (Hormidiellales) are quite rare terrestrial protists, according to current knowledge. The genus consists of two species, S. arenaria and S. costaricana, which are isolated in Eastern Europe and Central America, respectively. Only five strains of the genus have been studied using microscopy and/or molecular methods, based on published data. Here, we examined two strains, IRK-A 417 and 448, isolated from the chestnut soils of the Primorsky Range at the southwestern shore of Lake Baikal. The combination of molecular (18S rDNA, ITS, rbcL) and microscopy data (LM and TEM) was used to determine the taxonomic and phylogenetic position of the studied plants. It is established that they are most similar to the filamentous Streptosarcina species from Central America. IRK-A strains represent a new genetic lineage of the genus. The description of the new variety, S. costaricana var. goloustica, is proposed.

Keywords: algae distribution, biodiversity, Hormidiellales, integrative approach, morphology, phylogeny, terrestrial green microalgae

Received: January 28, 2025; Revised: April 28, 2025; Accepted: April 29, 2025; Prepublished online: September 3, 2025 

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