Niphotrichum sect. Elongata
in R. Ochyra et al., Cens. Cat. Polish Mosses, 138. 2003,.
Plants small, medium-sized to robust, green, olive or grayish green distally, brown. Leaves ovatelanceolate, lanceolate to triangular, sharply keeled to narrowly canaliculate in the distal part; costa in most leaves unbranched or only occasionally forked in some leaves, extending to three quarters of the leaf length to percurrent; leaf cell papillae tending to relatively small and inconspicuous in the distal lamina.
North America, Europe, temperate Asia, Atlantic Islands
Species 6 (4 in the flora).
Section Elongata is fairly homogeneous. Its members are readily recognized by their leaves, which are sharply keeled to narrowly canaliculate or canaliculate-keeled in the distal part, and their costae, which cease mostly at three quarters of the leaf length or are subpercurrent to percurrent and are generally undivided at the tip.
|1||Leaf margins recurved to 1/2-3/4 of the way up the leaf.||Niphotrichum muticum|
|1||Leaf margins recurved to the apex||> 2|
|2||Plants small; leaves 1.5-1.8 mm long; costa not grooved; laminal cells opaque, coarsely papillose, yellowish; alar cells forming a small and weakly inflated group; awns absent papillae or only faintly papillose at the base||Niphotrichum pygmaeum|
|2||Plants medium-sized to large; leaves 2-3 mm long; costa lying in a shallow or deeper furrow; laminal cells coarsely to slightly papillose, mostly transparent, not yellowish (except the base); alar cells forming a conspicuous and distinctly inflated group; awns mostly coarsely papillose||> 3|
|3||Supra-alar cells elongate, thin-walled and not sinuose, forming a transparent marginal border; awns erect-flexuose when dry, not or indistinctly decurrent, faintly papillose to epapillose in the distal part||Niphotrichum ericoides|
|3||Supra-alar cells short, thick- and sinuose-walled, not forming a translucent border; awns recurved when dry, conspicuously decurrent, coarsely papillose throughout.||Niphotrichum elongatum|