Summary: | FIG. 15. — SEM images of Nupela tenuicephala (Hustedt) Lange-Bertalot: A, B, external views of complete valves with recessed depressions covered with multiporoid volae; C, internal view of the whole valve; D, external view of the central area showing the expanded proximal raphe fissures and multiseriate poroid covers over the areolae; E, internal view of the central area with bent proximal fissures; F, internal views of the apex, helictoglossa small and elevated. Areolae interrupted around the apex. Scale bars: A-C, 5 µm; D, 2 µm; E, F, 1 µm. Published as part of Alibert, Marie, Hamilton, Paul B., Pienitz, Reinhard & Antoniades, Dermot, 2023, Small naviculoid species of Kobayasiella Lange-Bertalot, Adlafia Moser, Lange-Bertalot & Metzeltin, Nupela Vyverman & Compère and Sellaphora Mereschowsky from Tursujuq National Park, Hudson Bay region, Nunavik, Québec, pp. 157-187 in Cryptogamie, Algologie 20 (9) on page 181, DOI:10.5252/cryptogamie-algologie2023v44a9, http://zenodo.org/record/10376356
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