B. Papp szerk.: Studia Botanica Hungarica 30-31. 1999-2000 (Budapest, 2000)

Papp, Beáta, Ódor, Péter; Erzberger, Peter: Preliminary data about the present Hungarian local populations of rare European bryophytes

Studia bot. hung. 30-31, pp. 95-111, 1999-2000 PRELIMINARY DATA ABOUT THE PRESENT HUNGARIAN LOCAL POPULATIONS OF RARE EUROPEAN BRYOPHYTES B. PAPP

1

, P. ÓDOR

2 and P. ERZBERGER

3 'Department of Botany, Hungarian Natural History Museum H-1476 Budapest, Pf. 222, Hungary 2

Department of Botany and Ecology, Loránd Eötvös University H1087 Budapest, Ludovika 1er 2, Hungary 3

Belziger Str. 37, D-10832 Berlin, Germany Fourteen new and 13 confirmed, earlier Hungarian records of 16 species, included in the "Red data book of European bryophytes", are given in this paper. Observations about the local population size, accompanying bryophytes, habitat conditions, and threats are discussed. Maps of the Hungarian distribution of I^ophozia ascendens, Buxbaumia viridis, Pyramidula tetragona, Fissidens arnoldii are included. The IUCN categorization of Fissidens arnoldii is given on the basis of its recent Hungarian distribution compared with distribution data of the period 1930-1970. Key words: rare and threatened bryophytes, Hungarian distribution, IUCN categorization INTRODUCTION In the last few decades many species have become extinct and others are in danger of extinction because of the degradation of their natural habitats. At present there are some international efforts to conserve biodiversity and prevent the extinction of species (The convention on conservation of European wildlife and natural habitats (Bern Convention) 1979, European Community directive on the conservation of natural habitats and wild fauna and flora, 1992). Since current knowledge concerning threatened species and species-rich natural habitats still shows great differences with respect to different groups of organisms and areas, it is an important task for specialists of different groups of organisms in different regions to contribute to a better understanding of endangered species, including their taxonomy, their distribution, the size and the ecological demands of their populations. Although the European bryoflora is relatively well-known and the distribution of species has been summarised recently DULL ( 1983, 1984, 1985,1992), there are still areas in special need of work and the state of knowledge is far from being the same in different parts of Europe. Most European countries have red lists or red data books of bryophytes (e.g. CORTINI and ALEFFI 1993, DRUZHININA 1984, GRIMS 1986, LUDWIG et al. 1996, OCHYRA 1986, RAJCZY 1990). However, these national lists are written from a national perspective, often use different categories of rarity and do not take into account rarity or abundance of species on a larger geo-