Forsstroemia neckeroides Broth., Rev. Bryol. Lichénol.

Enroth, J., Fedosov, V. E., Fedorova, A. V., Ignatova, E. A. & Ignatov, M. S., 2019, Miscellaneous notes on the genus Forsstroemia in Russia (Neckeraceae, Bryophyta), Arctoa 28 (1), pp. 18-23 : 21-22

3. Forsstroemia neckeroides Broth., Rev. Bryol. Lichénol. 2: 7. 1929.

Lectotype (selected by Stark, 1987): [ China] “ Mandschuria , prope stantionem Hantoheva (Handahoedzi) viae ferrafiae, ad rupes”, coll. Litvinov s.n., 20 Jun 1903 ( H- BR 1742008 !; isolectotypes H-BR 1742011! , H.BR 1742012! ).

Description: Plants robust, in loose brownish-green, somewhat lustrous tufts. Secondary stems up to 2 cm long, curved, densely terete foliate, remotely and irregularly pinnately branched, branches up to 8 mm long, curved, similarly foliate as secondary stems. Stem leaves ovate to ovate-lanceolate, shortly acuminate, concave, 1.8–2.8 mm long, 0.7–1.1 mm wide; margin plane, entire to minutely crenulate; costa reaching 0.4–0.7 the leaf length; lamina cells ovate-elongate, 20–45 × 7–11 µm. Autoicous. Perigonia and perichaetia present. Sporophytes not available in Russian collection [Capsules immersed ( Stark, 1987)].

Differentiation: The concave leaves of F. neckeroides with “oily luster” resemble F. trichomitria , but in that species the shoots are not so much curved, the leaves are less concave, not plicate, the costa reaches only 0.2–0.4(– 0.5) the leaf length, and the commonly present sporophytes are exserted. Sympatric species of Lembophyllaceae that resemble F. neckeroides , i.e. Dolichomitriopsis diversiformis (Mitt.) Nog. , Dolichomitra cymbifolia (Lindb.) Broth. and Isothecium hakkodense Besch. have a still longer costa, 0.6–0.8 the leaf length, not conspicuously curved shoots, and all of them are dioicous.

Specimen examined: [ Russia, Primorsky Territory] Okeanskaya, Koreisakaya Sopka [“Corean Hill”], 6 Aug 1930, coll. A.S. Lazarenko, KW #12964.