Die Horn- und Lebermoose Österreichs

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This catalogue presents the first comprehensive synopsis of hornworts (Anthocerotophyta) and liverworts (Marchantiophyta) in Austria. Unlike other volumes in the Catalogus Florae Austriae, it does not include keys or descriptions of genera and species; instead, it focuses on ecology, phytosociology, and the distribution of all taxa. The general section offers a historical overview and current knowledge of these plants across the country's federal states, complemented by a brief “hepaticogeography” that emphasizes the unique hepaticofloristic features of Austria’s diverse landscapes. In the special section, four hornworts and 260 liverworts, along with various infraspecific taxa, are systematically presented. Nomenclature and systematics primarily adhere to the latest “World Checklist of Hornworts and Liverworts,” with some justified exceptions. Families are organized systematically, while genera are listed alphabetically. The catalogue pays special attention to species distribution, drawing on extensive literature and public herbarium collections, as well as numerous unpublished records and critically revised specimens. It also highlights ecological and phytosociological insights based on local observations. The decline in species diversity, affecting Austria’s hornworts and liverworts, is assessed alongside the increasing threats to species and their habitats. Optional notes on taxonomy and other relevant topics are inclu