Northernmost localities of Sawia canadensis (Charophyceae, Characeae) and Vaucheria taylorii (Xanthophyceae, Vaucheriaceae) from the Lower Lena Region (North Asia)

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Abstract

Sawia canadensis and Vaucheria taylorii were found in the northernmost locality of the both species distribution ranges. Vaucheria taylorii is a new species record for the Republic of Sakha (Yakutia). Both species were growing together in a small lake south of the Lena River delta, the northernmost continental locality for charophytes and freshwater Vaucheria in mainland Eurasia.

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About the authors

R. E. Romanov

Komarov Botanical Institute RAS

Author for correspondence.
Email: romanov_r_e@mail.ru
Russian Federation, Prof. Popov Str., 2, St. Petersburg, 197022

L. I. Kopyrina

Institute for Biological Problems of Cryolithozone of the Siberian Branch of RAS

Email: romanov_r_e@mail.ru
Russian Federation, Lenin Ave., 41, Yakutsk, 677980

N. N. Egorova

Institute for Biological Problems of Cryolithozone of the Siberian Branch of RAS

Email: romanov_r_e@mail.ru
Russian Federation, Lenin Ave., 41, Yakutsk, 677980

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2. Fig. 1. Key morphological traits of sterile plants of Sawia canadensis (a–c) and fertile monoecious thalli of Vaucheria taylorii (d–h) from the unnamed lake south of the Lena River delta, the Republic of Sakha (Yakutia): a, b – upper part of plant (a) and whorl of branchlets (b) showing branchlets consisting of gradually shortening cells and small end cells (arrowheads), c – small end cells of branchlets, d–h – generative branches, arrowheads indicate inflated generative branches near stipes of oogonia and verticillate arrangement of 4–5 plano-convex oogonia at short stipes (d, e), their apices directed upward and toward the antheridium, f – generative branch after falling of oogonia, its inflation near stipes of oogonia is visible, arrowhead indicates a stipe of oogonium, the antheridium at the top of branch was crumpled during pressing, g, h – different color of zygotes, arrowhead indicates antheridium extending over oogonia (g), h – generative branch, view from above. The photographs were taken from the intact pressed specimens. Scale bars: (a, b) – 2 mm, (c–h) – 0.5 mm.

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3. Fig. 2. Updated species distribution range of Sawia canadensis (Romanov et al., 2022; with additions from: Krasnaya…, 2022; this study). The second locality in the Oymyakon District of the Republic of Sakha (Yakutia), Lake Zalivnoe, is not shown because of insufficient data for its georeferencing (cf. Chemeris et al., 2023).

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