Plagiomnium rhynchophorum var. reidii (Dixon) T.J.Kop.

Plants medium-sized to large, in loose mats, dark green; terricolous or saxicolous. Stems erect, to 40 mm high, radiculose, densely leaved above; in section round, central strand large, cortical cells in 8-10 rows, large, thin-walled, becoming smaller and thickened toward margin. Plagiotropic stolons arising from various parts of erect stem, long creeping with leaves distant, anchored to substrate by rhizoid tufts; in section rounded, central strand small, inner cortical cells in 3-5 rows, large, thin-walled, outer cortical cells in 2 rows, smaller, thickened. Stem leaves larger and crowded toward apex, somewhat contorted dry, wide-spreading wet, undulate; oblong to oblong-spathulate or narrowly elliptical, 5-6 mm long; apex rounded to truncate or emarginate, mucronate; base narrow, slightly decurrent; margins plane, dentate to denticulate, occasionally entire. Costa strong below, tapering to apex, short excurrent as mucro; in proximal section elliptical, guide cells 4-6, large, thin-walled, ventral cells in 4 rows, first row above guide cells large, thin-walled, 3 outer rows smaller, incrassate, dorsal stereid band in small group of ± 12 cells in centre of costa, dorsal cells in 2-3 rows, larger, incrassate; in distal section rounded, guide cells large, distinct, dorsal stereid band absent, ventral and dorsal cells similar, each in 2 rows, thickened. Stolon leaves distant, somewhat scattered along stolon; orbicular to broadly elliptical, (1-)2-4 mm long; apex rounded-mucronate; margins plane, entire to serrate, strongly bordered; costa as in stem leaves. Laminal cells rounded, collenchymatous, quadrate to hexagonal or short-rectangular to short-rhomboidal, mostly 1-2:1, smooth, cell walls yellowish; extreme basal cells rectangular; marginal cells strongly differentiated, in 3-4 rows, elongate, ± vermiculate, thickened, yellowish; marginal teeth of 1-3 shorter cells. Synoicous. Perichaetia terminal on erect stems, polysetaceous; leaves similar to upper stem leaves. Seta erect, 14-16(-20) mm long, yellowish above, reddish below, arcuate distally; capsule horizontal to pendulous, ovate to cylindrical-ovate, 3.5-4.5 mm long, yellowish; exothecial cells quadrate to subhexagonal, 2 rows at mouth transversely rectangular; stomata scattered on lower urn, cryptopore; peristome double, reddish yellow, exostome teeth 16, triangular, 0.5-0.6 mm long, strongly trabeculate, endostome yellowish, finely papillose, basal membrane to 0.15 mm high, segments alternating with teeth, weakly keeled, perforated above, cilia 3, as long as segments; operculum long rostrate; spores rounded, 25-27 µm, yellowish, essentially smooth.