Lejeunea (sect. Nanolejeunea) G. E. Lee & Gradst., stat. nov.

[Clade IX]Lejeunea sect. Nanolejeunea(R. M. Schust.) G. E. Lee & Gradst. stat. nov. Lejeunea subg. Nanolejeunea R. M. Schust. (Schuster 1980: 1092) Type species Lejeunea laetevirens Nees & Mont. Description Plants dull green. Stems with 7 rows of epidermal cells surrounding few, 3–8 (– 10) rows of slightly smaller medullary cells. Cuticle finely to rather coarsely papillose. Oil bodies finely to coarsely granular, ca 3–10 per cell. Male bracteoles present throughout the male spike. Asexual reproduction by caducous branches and fragmenting shoots. Distribution Neotropical. Species Lejeunea laetevirens, L. multidentata M. E. Reiner & Mustelier, L. ramulosa Spruce. Notes The section is primarily characterized by rather dull green, dioicous plants with thin stems made up of rather few rows of medullary cells (less than 10), a papillose cuticle, bracteoles present throughout the male spike, and asexual reproduction via caducous branches or shoot fragmentation. Lejeunea multidentata approaches the sect. Crossotolejeunea by its coarsely papillose cuticle and 2 - winged, dentate-ciliate perianths, but the members of the latter section differ in monoicy, restriction of bracteoles to the base of the male spike, and absence of asexual reproduction by caducous branches or shoot fragmentation. References Reiner-Drehwald and Mustelier Martinez (2004), Reiner-Drehwald (2010 b).