M. Elena Reiner-Drehwald

Lejeunea huctumalcensis, a widely distributed Lejeuneaceae from the Neotropics, and its relation to Ceratolejeunea

Abstract Lejeunea huctumalcensis (Lejeuneaceae), a species widely distributed in the Neotropics, is characterized by the presence of ocelli in leaf lobes, innovations of lejeuneoid- and pycnolejeuneoid-type, perianths with five entire to ramified laciniae and vegetative reproduction via regenerants and caducous leaves. The species is a member of Lejeunea subgenus Otigoniolejeunea. Lejeunea acanthotis, L. schizotis, L. xiphotis and Ceratolejeunea dussiana are proposed as new synonyms of L. huctumalcensis. The relation of this species to Ceratolejeunea and other genera is discussed. Lejeunea huctumalcensis is described and illustrated.

The Genus Lejeunea in Miocene Amber from the Dominican Republic

Abstract A sterile liverwort inclusion in a piece of Miocene amber from the Dominican Republic is described and assigned to the extant genus Lejeunea. The inclusion resembles a complex of extant American Lejeunea species (L. angusta, L. aphanes, L. cladogyna, L. urbanii) that share autoecy, a small size, and ovate to obovate leaf lobes with rounded apices. A definite assignment to one of these species is impossible due to inacessibility of several diagnostically relevant characters such as perianths and oil bodies. The inclusion is clearly different from the extinct Lejeunea palaeomexicana; hence at least two different Lejeunea species occured in the Miocene of Middle America.

The Status of Neopotamolejeunea (Lejeuneaceae) and Description of a New Species from Ecuador and Southern Brazil

Abstract A new rheophytic liverwort species, Lejeunea topoensis (Lejeuneaceae), is described from the Andes of Ecuador and southern Brazil. The new species is intermediate between Lejeunea and Neopotamolejeunea, combining short leaf insertions typical of the former genus, and robust stems and pinnate branching with numerous short sexual branches characteristic of the latter. Neopotamolejeunea is therefore reduced to subgeneric status under Lejeunea. The discovery of L. topoensis adds a further species to the growing list of taxa with disjunct distribution in the Andes and the Atlantic coastal region of Brazil. It is postulated that the disjunct range resulted from long-distance dispersal, although it might to some extent reflect under-representation of collections. The new name L. juruana, replacing Neopotamolejeunea uleana, is proposed. Cheilolejeunea rupestris is a new synonym of C. beyrichii.

Otolejeunea (Hepaticae, Lejeuneaceae) in the neotropics

Type material of the epiphyllous liverwort Otolejeunea schnellii (Tixier) R.-L.Zhu & M.L.So (Lejeuneaceae, Hepaticae) from Brazil is described and illustrated. Its hitherto unknown gynoecia with mature perianths confirm the presence of the genus Otolejeunea in the neotropics. The ecology of the species and nomenclatural problems concerning its name are briefly discussed. A revised key to all known species of Otolejeunea is presented.

On Cephalantholejeunea (Lejeuneaceae, Hepaticae) from South America, and its Placement in the Subfamily Ptychanthoideae, Tribe Ptychantheae

Abstract Cephalantholejeunea temnanthoides (R.M.Schust.) R.M.Schust., the only known member of the genus Cephalantholejeunea R.M.Schust. (Lejeuneaceae, Hepaticae), is a rare Amazonian rheophyte with entire underleaves and unique, bisexual branches consisting of a terminal androecium with 2–6 female branches at its base, the gynoecial branches with only one gynoecium and lacking innovations. Sporophytes described here for the first time indicate that the genus is a member of the subfamily Ptychanthoideae, tribe Ptychantheae, not of the subfamily Lejeuneoideae as was uniformly believed. Communicating Editor: Alan Whittemore

Studies on Neotropical Lejeuneaceae (Jungermanniopsida). New Synonyms and Ceratolejeunea temnantha (Spruce) comb. nov.

Abstract Based on the study of type material of Neotropical Lejeuneaceae, the following new combination and synonyms are proposed: Ceratolejeunea temnantha (Spruce) comb. nov. (basionym: Lejeunea temnantha), Lejeunea huctumalcensis Lindenb. et Gottsche (= Hygrolejeunea grossereticulata Gottsche ex Steph., = H. sacculata Steph., = H. wrightii Steph.), Lepidolejeunea involuta (Gottsche) Grolle (= Hygrolejeunea glaziovii Steph.), Mastigolejeunea plicatiflora (Spruce) Steph. (= Lejeunea plicata Spruce). Ceratolejeunea temnantha is described and illustrated.

On Lejeunea rotundifolia and Dicladolejeunea (Lejeuneaceae, Jungermanniopsida)

Abstract The neotropical liverwort genus Dicladolejeunea, which has recently been placed in synonymy with Taxilejeunea, is proposed as synonymous with Lejeunea. Dicladolejeunea anomala and D. saccatiloba, as well as Taxilejeunea longiloba, are placed in synonymy with Lejeunea rotundifolia. Oil bodies, androecia, gynoecia, and the sporophyte of L. rotundifolia are described for the first time. Lejeunea rotundifolia is lectotypified.

Lejeunea boliviensis, a remarkable species with bizarre underleaves and eplicate perianths

Abstract Strepsilejeunea boliviensis Steph., a rare species endemic to Bolivia, bears eplicate perianths, emarginate to shortly bilobed apices of underleaves, and usual presence of blunt second tooth of the leaf lobule. It is transferred to the genus Lejeunea, primarily based on the large leaf cells and proximal hyaline papilla.

Cheilolejeunea laciniata (Lejeuneaceae, Marchantiophyta), a new species from Southeastern Brazil

Abstract Cheilolejeunea laciniata sp. nov. (Lejeuneaceae) from Southeastern Brazil is described and illustrated. The species is easily recognized by the dentate to laciniate leaf margins, a feature present only in two other species of Cheilolejeunea, C. norisiae from Panama and Cuba, and C. lacerata from Brazil. A key summarizing the differences of the three species is presented.

A new species of Omphalanthus (Lejeuneaceae) from Cuba

Abstract The new species Omphalanthus baracoensis, from the Yunque de Baracoa plateau, southeastern Cuba, is described and illustrated. The species is related to the widely distributed Omphalanthus filiformis, but differs in the presence of a large tooth at the lobule apex.