Acrolejeunea
Epiphytic on bark or rarely on rocks (not in Victoria) or soil (not in Victoria), monoicous or dioicous. Asexual reproduction occasionally by small caducous leaves (not in Victoria). Stems sparsely and irregularly branched; branches emerging from main stem near and ventral to an unmodified lateral leaf, and with a lobed and foliose collar at base, or occasionally near a lateral leaf lacking lobule, and without a collar at base. Leaves imbricate, spreading flat against substrate to rising away from substrate, when dry convolute and wrapped around stem, broadly attached to stem; lobe elliptic to ovate-falcate, entire, with a rounded apex; lobule smaller than lobe, ovate to rectangular (not in Victoria), fused along basal margin to lobe forming a straight to arching keel, ending in a notch or keel continuing on with curve of lobe margin, free along apical margin and plane, inflated along keel, becoming flat towards free margin, with 1–9 marginal teeth; hyaline papilla on inner surface of lobule near tooth furthest from stem, rarely near the second furthest tooth from the stem when multiple teeth are present (not in Victoria); teeth unicellular or multicellular; cells elongate-hexagonal, smooth, thin to thick-walled, with small to large (not in Victoria) cordate trigones, sometimes with occasional intermediate thickenings, with numerous ellipsoid to fusiform undivided and non-granular oil bodies when fresh, never forming ocelli. Underleaves present, one for each pair of lateral leaves, not lobed, obovate or orbicular to reniform (not in Victoria), entire, cuneate to slightly auriculate at base, plane to recurved at apex, imbricate to distant (not in Victoria); cells elongate-hexagonal, smooth, thin to thick-walled, with small to large (not in Victoria) cordate trigones, sometimes with occasional intermediate thickenings, with numerous ellipsoid to fusiform undivided and non-granular oil bodies when fresh, never forming ocelli. Perianth obovoid or pyriform, (4–) 5–10-keeled, without teeth or tubercles, with a short beak at apex.
Pantropical genus of twenty species with extensions south to temperate Australasia and north to Japan (Wang et al. 2014); one species, A. securifolia (Nees) Stephani, in Victoria.
Wang, J., Gradstein, S.R., Shi, X.-Q. & Zhu, R.-L. (2014). Phylogenetic position of Trocholejeunea and a new infrageneric classification of Acrolejeunea (Lejeuneaceae, Marchantiophyta). Bryophyte Diversity & Evolution 36: 31–44.
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