Plagiothecium berggrenianum Frisvoll

Plagiothecium berggrenianum Frisvoll, Lindbergia 7: 96, f. 2: a – i. 1981. Type material. Holotype: Norway, Svalbard, Haakonvii Land, Krossfjorden, Kollerfjorden, below bird cliff in Christian Michelsenfjell W, 50 m, 22 July 1974, A. A. Frisvoll, TRH B-19507! Isotype: C-M-20077! Paratypes: Lilliehöökfjorden, bird cliff in Nilsfjellet N, 50 m, 22 July 1974 (TRH); Bellsund, Vårsolbukta, by Camp Miller, 25 m, 29 July 1980, Olsen; S of Ingeborgfjellet, 10 m, 13 July 1980, Olsen (TRH); Sjuøyane; Parryya, 80°40'N, below brid cliff, 1868, Berggren, TRH. Description. Plants small, dense, yellowish green to green, glossy, with metallic luster; stems erect, 3–9 cm long; leaves very crowded on stem, julaceous, imbricate, symmetrical and very concave, thus the leaves often cracked, plicate, 1.5–3.1 × 0.7–1.1 mm (Fig. 8 A); the apex acuminate, recurved, hook-shaped; margins denticulate or not near the apex; laminal cells 120–170 × 12–15 μm at midleaf (Fig. 8 C), cell areolation quite loose; decurrencies well developed, consisting of 3–4 rows of rectangular cells. Distribution. Asia (Russian Federation); Europe (Norway); North America (Canada, U. S. A.).