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of Peruvian liverworts were made (and published) by Eduard Friedrich Poeppig, who visited Peru between 1829 and 1832 (Menzel 1984, Poeppig 1836). Among subsequent collectors, Richard Spruce (1884, 1885) visited the San Martín Department and described
INTRODUCTION During the October of 2001 my son Bence Pócs made a major trip on the tepuis of the Venezuelan Guayana. He made collections of mostly epiphyllous liverworts at my request close to Angel Falls (Salto Angel
The liverwort Thysananthus spathulistipus, earlier known to be distributed in the Eastern Himalaya, Northeast India and the Andamans in India, has been rediscovered in the Western Ghats after more than a century. It was last collected by Decoly and Schaul in Kurseong in 1898.Adetailed description of the species, an illustration and a distribution map are provided.
Reinerantha foliicola was recently described as a new epiphyllous genus and species in the Cololejeuneinae subtribe of the liverwort family Lejeuneaceae, from the montane rainforest region of Ecuador. A second locality of this unusual plant was detected in Venezuela in a rich Andean montane rainforest near Mérida, at an elevation of 2,300 m.
The liverworts Cololejeunea distalopapillata and C. vidaliana , earlier known to be distributed in Africa and, Africa and certain regions of Asia, respectively, are added to the Indian bryoflora from the Southern Western Ghats. They are provided with a detailed description, notes on habitat and distribution, and an illustration.
After the examination of the Cryptogam collection in the Herbarium of the University of Science, Vietnam National University Ho Chi Minh City (PHH), 25 species proved to be new to Vietnam, including one hornwort and 24 liverworts. Among them, four genera: Denotarisia Grolle, Gongylanthus Nees, Leiomitra Lindb. and Lepicolea Dumort. are new records for the country. Diagnostic characters and illustrations are given for some taxa, as well as locality notes and habitat descriptions are provided for each collecting area.
Within the framework of ASEAN-ARBC Biodiversity Program the hitherto unknown bryophyte flora of Vu Quang Nature Reserve in north central Vietnam was studied by the authors together with Prof. Benito C. Tan. From the lower vegetational belts 41 liverwort taxa were distinguished, of which Cheilolejeunea streimannii and Cololejeunea vuquangensis are new to science, 8 taxa are new to the whole Indochina or to Asia, while further 4 are new to the bryoflora of Vietnam. An analysis of distribution patterns shows the relative high proportion of endemics and the dominancy of Southeast Asian and of Indomalesian elements in the hepatic flora. Further investigations are needed to reveal the characters of the bryoflora in the montane forest belts at higher altitudes.
Frullania ramuligera , an overlooked, rare and long-lost liverwort, has been rediscovered in the southern Western Ghats in India after nearly two centuries. Till now the collection made by Perrottet during 1834–1839 in the Nilgiri Hills is the only representative of this species.
New or little known epiphyllous liverworts, XIX
Cololejeunea yelitzae, a new neotropical species
Cololejeunea yelitzae, member of subgen. Incalejeunea is described from Venezuela, as new to science. It is characterised by the very variable leaf width from wide ovate to narrow lanceolate within the same plant, by the acute leaf apex and by its acute lanceolate lobule with a wide gap between the 1st and 2nd teeth. Gemmae abundantly develop on leaf surface and even on the perianth. It is widely distributed in the mountain areas from Costa Rica to Bolivia. With this new taxon the known number of Neotropical Cololejeunea species is raised to 71.
How are bryophyte alpha and beta diversities distributed across spatial scales along an elevational gradient in an oceanic island? Which mechanisms and drivers operate to shape them? Starting from a multiscale hierarchical sampling approach along an 1000 m elevational transect, we used additive diversity partitioning and null modeling to evaluate the contributions of the alpha and beta diversity components to overall bryophyte diversity in Terceira Island, Azores. Substrate-level diversity patterns were explored by means of the Sørensen Similarity Index and the Lloyd Index of Patchiness. Elevation-level beta diversity was decomposed into its replacement and richness differences components, with several environmental variables being evaluated as diversity predictors. Bryophyte diversity proved to be primarily due to beta diversity between elevation sites, followed by diversity among substrates. Compositional differences between neighboring sites decreased with elevation, being mainly caused by species replacement and correlating with differences in relative humidity and disturbance. At the substrate level, we found a great homogeneity in terms of species composition, coupled with a low substrate specialization rate. We conclude that, in Terceira’s native vegetation patches, regional processes, such as environmental gradients associated with elevation, play a greater role in shaping bryophyte diversity than local processes. Moister and less disturbed areas at mid-high elevation harbor a richer bryoflora, consistently more similar and stable between neighbouring sites. Simultaneously, the different substrates available are somewhat ecologically redundant, supporting few specialized species, pointing to these areas providing optimal habitat conditions for bryophytes. Our findings provide a better understanding of how bryophyte diversity is generated in Terceira Island, indicating that management and conservation measures should focus on island-level approaches, aiming to protect and rehabilitate additional natural vegetation patches at different elevations, especially in the severely disturbed lowlands.
