Plagiothecium laetum var. laetum Schimp., Bryologia Europea

Plagiothecium laetum var. laetum Schimp., Bryologia Europea 5: 184, 495, Tab. II. 1851. ≡ Leskea laeta (Schimp.) Berggr., Acta Universitatis Lundensis, 2 Afd., 3 (7): 8. 1866 = Plagiothecium denticulatum var. laetum (Schimp.) Lindb., Animadversiones de Hypno elegante 31. 1867 ≡ Plagiothecium denticulatum subsp. laetum (Schimp.) Kindb., Bihang till Kongliga Svenska Vetenskaps-Akademiens Handlingar 7 (9): 46. 1883 ≡ Hypnum denticulatum var. laetum (Schimp.) Lindb. in Lesquereux & James, Manual of the Mosses of North America 367. 1884. Type: [Switzerland,] in Rhaetic Alpe Albula, ubi in regione sylvatica versus Ponte in logno putrido, et supra hanc reionem prope Weissenstein, in rupium fissuris Dicrano gracilescenti intermixtum, W. P. Schimper aestate 1845 detexit. Nusquam alias adhuc observatum est. Syntype: PC 0132699!, PC 0132701! Description. Plants small, light green, glossy; leaves forming 20–70 ° angle with stem, complanate, more or less concave, asymmetrical, ovate-lanceolate, with one side almost flat, 1.0–2.0 × 1.1–1.3 mm (Fig. 11 A); the apex acute, denticulate near the apex or not; laminal cells linear, 80–150 × 6–8 μm at midleaf (Fig. 11 D), cell areolation dense; decurrencies of 1–3 rows of rectangular cells; setae 1.3–1.8 cm, capsule straight. Distribution. Asia (Azerbaijan, China, Democratic People’s Republic of Korea, Georgia, Islamic Republic of Iran, Japan, Kazakhstan, Kyrgystan, Mongolia, Republic of Korea, Russian Federation, Taiwan, Turkey); Europe (Albania, Andorra, Austria, Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Kosovo, Latvia, Lichtenstein, Lithuania, Luxemburg, Montenegro, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Ukraine, United Kingdom); North America (Canada, U. S. A.).