Dolichomitra cymbifolia (Lindb.) Broth., Nat. Pflanzenfam. I

Ignatova, E. A., Fedosov, V. E., Fedorova, A. V., Spirina, U. N. & Ignatov, M. S., 2019, On moss family Lembophyllaceae in the Russian Far East, Arctoa 28 (2), pp. 179-202 : 197-199

Dolichomitra cymbifolia (Lindb.) Broth., Nat. Pflanzenfam. I (3): 868. 636. 1907.

Plants robust, pale-green or yellowish-green, forming loose tufts. Secondary stems erect, to 8 cm long, curved above, irregularly branched, stipe distinct; flagelliform-attenuate branches occasionally present. Secondary stem leaves imbricate when dry and wet, 1.6–2.0×1.6– 1.3 mm, broadly oblong, oblong-elliptical or almost round, widest at mid-leaf, widely obtuse, strongly concave; costa single, stout, gradually narrowing, often forked, extending to 2/3–3/4 the leaf length; margins widely incurved, irregularly dentate at rounded apical part, serrate at upper 1/3, entire below; upper laminal cells vermiform, 20–25×8–10 µm, with unevenly thickened walls, with pores near cell ends; median laminal cells sublinear, not flexuose, 35–45×6–7 µm, thick-walled, strongly porose; basal laminal cells sublinear, 40– 50×8–9 µm, thick-walled, strongly porose; alar group indistinct or weakly differentiated, small. Branch leaves similar to secondary stem leaves.

Dioicous. Archegonia on secondary stems. Male plants and sporophytes unknown in Russia. [Setae flex-

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Fig. 2 . Dolichomitra cymbifolia (from: Russia, Kuril Islands, Shikotan, Bakalin K-42-4-07, MW9046187): 1-2, 6 – habit, dry; 3, 7 – branch leaves; 4 – upper laminal cells; 5 – mid-leaf cells; 8 – basal laminal cells. Scale bars: 1 cm for 1; 2 mm for 2, 6; 1 mm for 3, 7; 100 µm for 4, 5, 8.

uose when dry, 2.0– 2.5 cm long. Capsules erect, symmetric, oblong-cylindric, smooth, brown. Annulus deciduous. Exostome teeth ca. 500 µm long, smooth below, papillose in upper 2/3; endostome basal membrane low, segments keeled, not perforated, cilia lacking. Spores 10– 15 µm].

Distribution and ecology. Dolichomitra cymbifolia is known from Japan, Korea, China, and Taiwan; it is newly reported from South Kuril Islands in Russia. Grows in forests, on rocks covered with humus layer; in Shikotan Island it was collected at 250 m a.s.l., in grass community intermingled with Juniper thickets, on a ledge of wet cliff.

Specimens examined: Russia, South Kuril Islands , Shikotan Island, Notoro Mt., 43°47’N, 146°44’E, 250 m alt., Bakalin K-45-29-07 ( MHA, MW9046191 ) .

Differentiation. Dolichomitra cymbifolia can be recognized by robust plants; imbricate foliage; oblong-elliptical to almost round, strongly concave leaves with widely incurved margins; widely obtuse apices; leaf margins irregularly serrate only at apex and serrulate in upper 1/2; and almost indistinct alar groups; strongly porose median and basal cells are also unique for Dolichomitra among the Lembophyllaceae in the Russian Far East. Differences from Dolichomitriadelphus hakkodensis are discussed under that species.

Figures

Fig.2. Bayesian molecular phylogenetic reconstruction based on concatenated nuclear ITS and chloroplastic ITS–trnG–trnS-F (including trnL–F) data. Bayesian posterior probability and boot- strap support from maximum likelyhood analysis are shown at branches. GenBank accession numbers and voucher specimen information see in Appendix 2.