Plagiothecium berggrenianum Frisvoll

Wolski, Grzegorz J., 2025, The genus Plagiothecium (Plagiotheciaceae) in Europe — current state of knowledge, checklist and key to taxa, PhytoKeys 253, pp. 67-102 : 67-102

publication ID	https://doi.org/10.3897/phytokeys.253.142268
DOI	https://doi.org/10.5281/zenodo.14968381
persistent identifier	https://treatment.plazi.org/id/FCBBB5DB-4B65-5C56-901E-1641029E1C4A
treatment provided by	PhytoKeys by Pensoft
scientific name	Plagiothecium berggrenianum Frisvoll
status

Treatment

Plagiothecium berggrenianum Frisvoll View in CoL , 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 View Figure 8 ); 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 View Figure 8 ), 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.).