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Bryophyte communities of the loess cliffs of the Pannonian basin and adjacent areas, with the description of Hilpertio velenovskyi-Pterygoneuretum compacti ass. nov.: Studies on the cryptogamic vegetation of loess cliffs, VI

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A phytosociological analysis of the loess cliff bryophyte communities of the Pannonian basin revealed four different communities: the newly described Hilpertio velenovskyi-Pterygoneuretum compacti ass. nov., with its subassociation typicum (abundant in central, eastern Hungary and Slovakia) and its subassociation crossidietosum crassinervis (typical for the warm and dry cliffs of southern Hungary, Northern Serbia and Western Romania along the lower Danube under Submediterranean climatic influence); the Didymodon cordatus-Grimaldion fragrantis base community, a floristically impoverished ensamble on cliffs in contact to a cooler climate; and the already known Aloinetum rigidae, typical for the more humid cliffs of western Hungary. All can be classified within the Grimaldion fragrantis alliance (Barbuletea unguiculatae class). They consist of xerotolerant acrocarpous mosses, forming greyish, hardly visible cryptobiotic crusts during summer. These communities harbour some of the phytogeographical most interesting, rare and endangered bryophytes of Hungary, displaying disjunctions with southeastern Spain and the Near and Middle East.

Die pflanzensoziologische Bearbeitung der Bryophytengesellschaften der Lösskliffe des Pannonischen Beckens erbrachte vier Gesellschaften: das hier neu beschriebene Hilpertio velenovskyi-Pterygoneuretum compacti mit seinen beiden Subassoziationen-typicum (weit verbreitet in Zentral-, Ost-Ungarn und der Slowakei) und -crossidietosum crassinervis (charakteristisch für die warm-trockenen Kliffe Süd-Ungarns und des Titel Lössplateaus Yugoslawiens); die Didymodon cordatus-Grimaldion fragrantis Basalgesellschaft, eine floristisch-verarmte Ausbildung auf Lösskliffen in Kontakt zu kühlerem Klima; und das bereits bekannte Aloinetum rigidae, kennzeichnend für die feuchteren Kliffe West-Ungarns. Alle Gesellschaften gehören zum Grimaldion fragrantis Verband (Klasse: Barbuletea unguiculatae). Sie werden von xerotoleranten, akrokarpen Laubmoosen aufgebaut, die graue, im Sommer kaum sichtbare kryprobiontische Krusten bilden. Diese Gesellschaften beherbergen einige der pflanzengeographisch interessantesten, seltensten und gefährdetsten Moose Ungarns, die auffallende Disjunktionen mit Südost-Spanien und dem Vorderen Orient zeigen.
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Document Type: Research Article

Publication date: August 1, 2002

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  • Nova Hedwigia is an international journal publishing original, peer-reviewed papers on current issues of taxonomy, morphology, ultrastructure and ecology of all groups of cryptogamic plants, including cyanophytes/cyanobacteria and fungi. The half-tone plates in Nova Hedwigia are known for their high quality, which makes them especially suitable for the reproduction of photomicrographs and scanning and transmission electron micrographs.
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