Plagiothecium denticulatum var. obtusifolium Moore

Plagiothecium denticulatum var. obtusifolium (Turner) Moore, Proceedings of the Royal Irish Academy 1: 424. 1873. ≡ Hypnum denticulatum var. obtusifolium Turner, Muscologiae Hibernicae Spicilegium 146, T. 12, f. 2. 1804 ≡ Hypnum obtusifolium (Turner) Brid., Muscologiae Recentiorum Supplementum 2: 93. 1812 ≡ Stereodon denticulatus var. obtusifolius (Turner) Brid., Bryologia Universa 2: 824. 1827 ≡ Plagiothecium obtusifolium (Turner) J. J. Amann, Mémoire de la Société Vaudoise des Sciences Naturelles 3: 61. 1928. Holotype: figure 2, tabela 12 “ T. 12, f. 2 ”, Turner 1804: 237. Epitype (designated by Wolski et al. 2022 d): [Ireland,] in summo montis Bulbein jugo, ab oculatissimo D. Brown lectam, benigne communicavit D. Templeton, BM 000890810! = Plagiothecium sandbergii Renauld & Cardot, Contributions from the United States National Herbarium 3: 274. 1895. Lectotype (designated by Wolski et al. 2022 d): U. S. A., Idaho, Kootenai County, Hope, J. H. Sandberg, D. T. Macdougal, A. A. Heller 1174, August 1892, PC 0132604! Isolectotypes: NY 507114! (available online), US 70396! (available online), FH 220148. Additional original material from locus classicus (not signed “ No. 1174 ”), NY 507115! (available online); additional Sandberg material, potentially from locus classicus PC 0132605! and Sandberg material FH 220147. = Plagiothecium denticulatum var. auritum Kern, Jahresbericht der Schlesischen Gesellschaft für Vaterländische Cultur 91 (Abt. 2 b): 97. 1914. Lectotype (designated by Wolski et al. 2022 d): [Italy,] South Tirol, Ortler, Martelltal, in Felshöhlungen oberhalb der Cevedalehütte, 2350 m, 30 July 1913, F. Kern s. n., herb. I. Thériot, PC 0132639! Description. Plants small, light green, with metallic luster; stem 0.9–2.5 cm; leaves julaceous, very concave, ovate-elliptical, gently asymmetrical, 1.0–2.2 × 0.5–1.2 mm (Fig. 1 B); the apex obtuse, not denticulate; laminal cells linear, 50–140 × 10–21 μm at midleaf (Fig. 1 E), cell areolation quite loose; decurrencies broad, alar cells rounded. Distribution. Asia (China, Islamic Republic of Iran, Japan, Nepal, Russian Federation, Turkey); Europe (Austria, Bulgaria, Czech Republic, Finland, France, Germany, Hungary, Iceland, Ireland, Italy, Kosovo, Luxembourg, Montenegro, Netherlands, Poland, Slovenia, Spain, Sweden, Switzerland, Ukraine, United Kingdom); North America (Canada, U. S. A.).