Summary: | FIG. 2. — Ulnaria pilum Kulikovskiy & Lange-Bertalot LAB59: A, LM; B, SEM, external view and central area; C, internal view and central area; D, SEM, external view and the valve apex; E, internal view and the valve apex, rimoportula is located at an oblique angle relative to the central sternum; F, SEM, external view, two small spines at the apex. Scale bars: A, 50 µm; B-E, 5 µm; F, 1 µm. Published as part of Zakharova, Yulia R., Bedoshvili, Yekaterina D., Petrova, Darya P., Marchenkov, Artyom M., Volokitina, Nadezhda A., Bashenkhaeva, Maria V., Kopyrina, I., Grachev, Michael A. & Likhoshway, Yelena V., 2020, Morphological description and molecular phylogeny of two diatom clones from the genus Ulnaria (Kützing) Compère isolated from an ultraoligotrophic lake at the Pole of Cold in the Northern Hemisphere, Republic of Sakha (Yakutia), Russia, pp. 37-45 in Cryptogamie, Algologie 20 (6) on page 41, DOI:10.5252/cryptogamie-algologie2020v41a6, http://zenodo.org/record/7826395
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