Capillolejeunea S.W.Arnell, Svensk Bot. Tidskr.

He, Qiong, Wei, Yu-Mei, Pócs, Tamás & Zhu, Rui-Liang, 2014, The reappraisal of Capillolejeunea S. W. Arnell (Marchantiophyta, Lejeuneaceae), Phytotaxa 175 (3), pp. 166-170 : 167

Capillolejeunea S.W.Arnell, Svensk Bot. Tidskr. 59: 69. 1965 ( Arnell 1965).

Type:— Capillolejeunea mascarena S.W.Arnell, Svensk Bot. Tidskr. 59: 69. 1965 ( Arnell 1965).

Autoecious. Plants green to yellowish green, 2−12 mm long. Shoots 0.4−0.9 (−1.1) mm wide, irregularly branched, branching of the Lejeunea - type, leaf sequence of vegetative branches lejeuneoid. Stem 40−60 µm in diameter, in transverse section with 7 cortical cells and 3 medullary ones, ventral merophyte 2 cells wide. Rhizoids at base of underleaves, few, tufted, usually hyaline, rhizoid disc absent. Leaves contiguous to imbricate, diverging from stem at an angle of 50−60°; leaf lobes asymmetrically ovate or obovate, somewhat concave, falcate, 0.3−0.6 mm long, 0.2−0.3 mm wide, margin entire, dentate to ciliate, apex ± incurved; leaf lobules ovate, strongly inflated, ca. 1/3 as long as the lobes (up to 1/2 as long as lobes in some branch leaves), lateral free margin straight, usually slightly incurved (except for apex), bordered by 4 subquadrate to rectangular marginal cells, apex usually constricted, with a unicellular, usually curved apical tooth, directed towards leaf apex, keel arched, smooth, hyaline papilla subspherical to oblong, situated at the proximal base of apical tooth. Cells of leaf lobe with thin to moderately thickened walls and small trigones, usually without intermediate thickenings. Oil bodies small, compound (fide Arnell 1965). Ocelli oblong, 3−5 (−9) per leaf lobe, forming 1 (−2) longitudinal, unbroken row(s), the lowermost always basal (next to stem cell) or suprabasal (cf. Zhu & So 2001). Underleaves remote, longer than wide, 1.5−3 times as wide as stem, bilobed to 1/2 their length, sinus U- or V-shaped, lobes narrowly triangular, erect, acute at apex, 3−7 cells long, 3−4 cells wide at base, inner lateral margin nearly entire, outer lateral one usually with a small tooth, insertion line almost straight to subtransverse, base cuneate (never cordate). Androecia intercalary, rarely terminal, usually on long lateral branches or on main shoots, bracts in 2−8 pairs, hypostatic, antheridia 1−2 per bract, subspherical, bracteoles 1−3, borne only at the basal portion of androecium, similar to ordinary underleaves. Gynoecia usually on short or long branches, with 1(−2) pycnolejeuneoid innovations; bracts obovate, deeply and unequally bifid, the lobe broadly obovate, apical margin usually crenulate to slightly dentate, rarely with 1–several ciliate teeth, base with 3–8 ocelli as in leaf lobe, lobule oblong or lingulate, ca. 1/2 as long as the bract lobe, apex obtuse to acute, keel slightly sinuate to straight, ca. 2/3 as long as the lobule; bracteole connate with bracts on both sides at base, oblong, margin nearly entire to slightly dentate, apex bilobed to 1/5−1/4 its length, sinus usually obtuse. Perianths about 1/3−2/3 exserted, obovoid to obtriangular, 0.40−0.75 mm long, 0.23−0.40 mm wide at middle, inflated, with (4−) 5 keels, antical keel a little lower than the others and entire, but usually indistinct, keels entire to crenulate, sometimes with weak denticulations and ciliate or laciniate projections near apex, surface of perianth smooth, beak short, 1−3 cells long, ocelli in perianth several to numerous, scattered. Seta articulate, containing 12 outer cells rows surrounding 4 inner ones. Asexual reproduction not clear, possibly by slightly specialized branchlets.