Lejeunea (Lejeunea) Lib.

Lejeunea subg. Lejeunea Lejeunea subg. Eulejeunea Spruce (Spruce 1884: 260), nom. inval. (ICN Art. 21.3, Turland et al. 2025) ? Amblyolejeunea Jovet-Ast (Jovet-Ast 1949: 49) – Type species: A. fulfordiae Jovet-Ast (= L. fulfordiae (Jovet-Ast) R. L. Zhu). ? Lejeunea subg. Pleurolejeunea R. M. Schust. & Kachroo (Schuster 1963: 123) – Type species: L. patagonica Steph. Type species Lejeunea cavifolia (Ehrh.) Lindb. Description Plants mostly monoicous (in more than 80 % of the analysed species). Oil bodies granular or homogeneous. Gynoecial bracts usually broadly fused with the bracteole on both sides. Asexual reproduction by specialized devices usually absent. Distribution Pantropical, with some species extending into temperate regions. Species Forty-eight species were found to belong to this subgenus. Notes The typical characters of subg. Lejeunea are the predominantly monoicous sexuality, the usually broadly connate female bracts and bracteole, and the scarcity of specialized devices for asexual reproduction. Based on the molecular phylogenetic, morphological, and nomenclatural evidence, subg. Lejeunea is subdivided into four sections: sect. Glaucescentes, sect. Lamacerinae, sect. Lejeunea, and sect. Macrolejeunea. Amblyolejeunea, a monospecific neotropical genus characterized by undivided underleaves and eplicate perianths without beak, and L. subg. Pleurolejeunea, a group of species characterized by gynoecia on abbreviated branches without innovations and with long 5 - keeled perianths, are tentatively placed in synonymy of subg. Lejeunea because of the broadly connate female involucre in the two groups, autoicy, and the absence of specialized devices for asexual reproduction. A molecular phylogenetic analysis of the two groups and a study of the oil bodies should be carried out to verify their taxonomic relationship. Interestingly, one of the members of subg. Pleurolejeunea, L. syoshii Inoue, has homogeneous oil bodies (Inoue 1977), suggesting an affinity to sect. Lejeunea.