Plagiothecium svalbardense Frisvoll, Norsk Polarinstitutt Skrifter, Part 2. Bryophytes 198: 103. 1996. Type material. Holotype: Norway, Svalbard, Krossfjorden, Kollerfjorden, below a bird cliff in Christian Michelsenfjella W, 50 m, 22 July 1974, A. A. Frisvoll, TRH B-19481! Isotypes: O, S, TRH. Description. Plants medium-sized, dark green, dull, without metallic luster; stems 2–4 cm long, more or less julaceous; leaves concave, two types of leaves: symmetrical and asymmetrical, ovate, 2.4–2.8 × 1.2–1.5 mm (Fig. 8 B); the apex acuminate, often gently curved; margins not denticulate near the apex; laminal cells narrowly elongate-hexagonal, asymmetric, 80–120 × 7–10 μm at midleaf (Fig. 8 D), cell areolation tight; decurrencies of 3 rows of rectangular to quadrate cells. Distribution. Asia (Russian Federation); Europe (Norway, Sweden).

Published as part of Wolski, Grzegorz J., 2025, The genus Plagiothecium (Plagiotheciaceae) in Europe — current state of knowledge, checklist and key to taxa, pp. 67-102 in PhytoKeys 253 on pages 67-102, DOI: 10.3897/phytokeys.253.142268