Lejeunea (sect. Apolejeunea) R. M. Schust.

[Clade X]Lejeunea sect. Apolejeunea(Inoue) R. M. Schust. (Schuster 1980: 941) Lejeunea subg. Apolejeunea Inoue (Inoue 1976: 186) Type species Lejeunea compacta (Steph.) Steph. Description Plants frequently rather small, less than 1 mm wide. Stems with 8–22 rows of medullary cells. Leaves asymmetrically ovate with widely arched dorsal margin and straight to slightly curved ventral margin, leaf apex narrowly pointed or rounded, usually decurved. Cuticle finely punctate-papillose. Oil bodies finely granular, 2–8 per cell. Lobules large, 1 / 3–1 / 2 × leaf length, strongly inflated. Androecia usually with an apical innovation; bracteoles present throughout the male spike. Gynoecia on long shoots, with one sterile innovation, bracts shortly fused with the bracteole at the base. Perianths 5 - keeled in the upper half, beak very short. Asexual reproduction by specialized devices absent. Distribution East Asia. Species Lejeunea compacta, L. curviloba Steph. (?), L. neelgherriana Gottsche (= L. claviflora (Steph.) S. Hatt.), L. nepalensis Steph., L. parva (S. Hatt.) Mizut., L. soae R. L. Zhu, Y. M. Wei, L. Söderstr., A. Hagborg & von Konrat, L. wightii Lindenb. Notes The outstanding characters of this section are the rather small plants with asymmetric leaf lobes and a pointed (or rounded), decurved leaf apex, the rather large, inflated lobules and the presence of bracteoles throughout the male spike. The common presence of an apical innovation on the male spike is a further characteristic feature seen in some members of this section (Mizutani 1992). Lejeunea curviloba was resolved in an unsupported sister position to the Apolejeunea clade and is provisionally placed in sect. Apolejeunea because of its close morphological similarity to members of this section (Mizutani 1992). References Mizutani (1961, 1992), Inoue (1976), Schuster (1980).