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Herdwangen-Schönach, Germany

Feldberg K.,Ludwig Maximilians University of Munich | Schneider H.,Natural History Museum in London | Stadler T.,ETH Zurich | Schafer-Verwimp A.,Mittlere Letten 11 | And 2 more authors.
Scientific Reports | Year: 2014

Recent studies have provided evidence for pulses in the diversification of angiosperms, ferns, gymnosperms, and mosses as well as various groups of animals during the Cretaceous revolution of terrestrial ecosystems. However, evidence for such pulses has not been reported so far for liverworts. Here we provide new insight into liverwort evolution by integrating a comprehensive molecular dataset with a set of 20 fossil age constraints. We found evidence for a relative constant diversification rate of generalistic liverworts (Jungermanniales) since the Palaeozoic, whereas epiphytic liverworts (Porellales) show a sudden increase of lineage accumulation in the Cretaceous. This difference is likely caused by the pronounced response of Porellales to the ecological opportunities provided by humid, megathermal forests, which were increasingly available as a result of the rise of the angiosperms.

Schafer-Verwimp A.,Mittlere Letten 11
Phytotaxa | Year: 2014

One hundred and seven species, two subspecies and one variety of liverworts are newly reported from Panama including 27 species which were previously unknown from Central America. In total, 328 new province records are listed. The number of liverwort and hornwort species from Panama is now close to 470. Notes on the geographical distribution of the species are provided. © 2014 Magnolia Press.

Robbert Gradstein S.,CNRS Systematics, Biodiversity and Evolution Institute | Schafer-Verwimp A.,Mittlere Letten 11
Cryptogamie, Bryologie | Year: 2012

The liverwort Archilejeunea nebeliana Gradst. et Schäf.-Verw. sp. nov. (Lejeuneaceae) is described from submontane rain forest of southern Ecuador. The new species is a member of A. subg. Archilejeunea and differs from all other species of this group by narrowly and obtusely pointed leaves, thin-walled lobule cells, stem epidermis with darker-colored middle lamella, and narrowly elongate female bracts and bracteoles with acute to acuminate apices. The new species constitutes the first record of subg. Archilejeunea from the Andes and is a further addition to the unusually rich flora of the Andes of southern Ecuador. The species is named in honor of Dr. Martin Nebel. © 2012 Adac. Tous droits réservés.

Gradstein S.R.,French Natural History Museum | Schafer-Verwimp A.,Mittlere Letten 11
Cryptogamie, Bryologie | Year: 2011

A new species of Lejeuneaceae from montane cloud forest of Colombia and Costa Rica, Harpalejeunea scabra, is described and illustrated. The new species is characterized by the papillose dorsal leaf surface, a feature occurring in several related genera such as Lejeunea and Drepanolejeunea, but new to Harpalejeunea. Further diagnostic characters of H. scabra include the dorsal leaf margin with 1-3 teeth and the peculiar lobule with twinned apical teeth, free margin bordered by very narrow cells and aperture circular with the distal end of the apical margin adnate to the surface of the lobe. The new species somewhat resembles the enigmatic Drepanolejeunea navicularis Steph. from páramo of Colombia and Venezuela. The affinities of the two species are discussed. © 2011 Adac. Tous droits réservés.

Heinrichs J.,Ludwig Maximilians University of Munich | Schafer-Verwimp A.,Mittlere Letten 11 | Feldberg K.,Ludwig Maximilians University of Munich | Schmidt A.R.,University of Gottingen
Review of Palaeobotany and Palynology | Year: 2014

We describe a sterile gametophyte fragment of a leafy liverwort preserved in Cretaceous amber from Myanmar, and place it in the extant genus Gackstroemia, as G. cretacea sp. nov., representing the second extant genus of leafy liverworts reported from the Mesozoic. The complicate bilobed leaves of the fossil have a ventral lobule forming a ciliately toothed, Frullania-type water sac, and a dorsal lobe carrying a single apical cilium, as well as bifurcate underleaves being either flat or developed as a pair of ciliately toothed water sacs. Gackstroemia cretacea is the first fossil record of Lepidolaenaceae, a family being at the present time confined to the southern temperate zone. The new fossil adds to growing evidence that southern disjunctions cannot exclusively be explained by Gondwanan vicariance and that the range of Lepidolaenaceae once included parts of Laurasia. © 2014 Elsevier B.V.

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