Acta Biologica Plantarum Agriensis 9(2): 3–260 (2021) ISSN 2061-6716 (Print), 2063-6725 (Online) Research article http://abpa.ektf.hu/ https://doi.org/10.21406/abpa.2021.9.2.3 KEYS FOR THE IDENTIFICATION OF BRYOPHYTES OCCURRING IN HUNGARY Peter Erzberger Belziger Str. 37, D 10823 Berlin, Germany, E-mail:
[email protected] Abstract: Keys for the identification of all bryophytes presently known to occur in Hungary are presented. The three groups: Hornworts (2 taxa), Liverworts (149 taxa), and Mosses (541 taxa) are treated separately. Bryophyte identification using these keys proceeds in two steps: 1. Artificial keys to the genera, 2. Keys from genera to species, arranged systematically according to recent taxonomy. Each species of the Hungarian bryophyte flora is assigned to one of six frequency classes (very common: cc, common: c, widespread: w, rare: r, very rare: rr, not seen: n.s.). A glossary explaining the technical terms used in the keys and an index of genera are included. Keywords: Genera, species, glossary, mosses, liverworts, hornworts INTRODUCTION Identification of Hungarian bryophytes up to now had to rely on either keys in Hungarian published 68 and 38 years ago, respectively, long out of print (Boros 1953, Orbán and Vajda 1983), and out-of-date in many respects, or on keys written in various languages for other countries or regions (e.g. for liverworts and hornworts: Smith (1991), Paton (1999), Damsholt (2002), Schumacker and Váňa (2005), Frey et al. (2006), Casas et al. (2009), Atherton et al. (2010) in English, Gradstein and van Melick (1996), Siebel and During (2006) in Dutch, Müller (1905–1916, 1951–1958), Frahm and Frey (1992, 2004), Frey et al.