Plagiothecium sylvaticum var. immersum G. J. Wolski 2025, comb. nov.

Plagiothecium sylvaticum var. immersum (Mönk.) G. J. Wolski comb. nov. ≡ Plagiothecium platyphyllum fo. immersa Mönk., Die Laubmoose Europas 867. 1927. Type: [Germany,] Aus dem Harze, Thüringen, der Rhön, dem Fichtelgebirge, aus Böhmen, dem Bayerischen Walde, Mähren, der Schweiz (Kanton Uri), Norditalien (Provinz Como) und Bulgarien mir bekannt geworden. Lectotype (designated here): [Switzerland,] Kanton Uri, Schöllenen, 1100–1400 m, 18 August 1884, Lorrens, HBG- 021127! Description. Plants large, dark green, dull, without metallic luster; leaves asymmetrical, complanate, ovate, not imbricate and not julaceous, 3.4–3.6 × 1.4–2.0 mm (Fig. 3 B), often with rhizoids on the dorsal side of the leaf (Fig. 3 E); the apex acute and denticulate, often eroded (Fig. 3 C); laminal cells 90–150 × 8–16 μm at midleaf, cell areolation loose; decurrencies long, consisting of 3–5 rows of rounded and inflated cells; capsule unknown so far. Distribution. Europe (Bulgaria, Czech Republic, Italy, Switzerland), but the range of this taxon still requires research.