Plagiothecium curvifolium var. recurvum G. J. Wolski & W. R. Buck

Plagiothecium curvifolium var. recurvum (Warnst.) G. J. Wolski & W. R. Buck, PLoS ONE 17 (11): e 0275665. 2020. ≡ Plagiothecium denticulatum var. recurvum Warnst., Verhandlungen des Botanischen Vereins für die Provinz Brandenburg und die Angrenzenden Länder 27: 73. 1885. Lectotype (designated by Wolski et al. 2022 a): Germany, prov. Brandenburg, auf nacktem Bodem in Kiefernschonungen vor Altruppin, Neuruppin, C. Warnstorf, JE 04004201! Isolectotypes: G! = Plagiothecium curvifolium var. hypnophyllum Ukrainskaya, Novosti Sistematiki Nizaikh Rastenii 31: 183, f. 12–14. 1996. Type: [Russia,] Prov. Mosquensis, distr. Krasnogorskensis, 2 km ad austro-occidentem a Krasnogorsk. Ad Betulam in silva, 28 VII 1986, Ignatov. In herbario bryologico Horti Botanici Publici Mosquae conservatur, MHA, VLA! Description. Plants medium-sized, bright-green to green; stems 1.5–2.0 cm long; leaves complanate, strongly asymmetrical, hooked, lanceolate, concave, curved towards the ground, 1.7–2.2 × 0.6–0.9 mm (Fig. 9 B); margin sometimes incurved; the apex acuminate, usually denticulate by 2–3 teeth; cells linear-vermicular, 60–120 × 7–9 μm at midleaf (Fig. 9 D), cell areolation tight; decurrencies forming semi-distinct auricles, of 2–3 rows of rectangular, sometimes inflated cells; capsules inclined. Distribution. Asia (Russia); Europe (Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Great Britain, Hungary, Latvia, Poland, Slovakia, Sweden); North America (Canada).