B. Papp szerk.: Studia Botanica Hungarica 34. 2003 (Budapest, 2003)

Papp, Beáta; Erzberger, Peter: Data about the actual local populations of bryophyte species protected in Hungary

METHODS To obtain the earlier distribution data of the investigated species the Bryophyte Herbarium of the Hungarian Natural History Museum, Budapest (BP) and Eszterházy Karoly College, Eger (EGR) were consulted. The retrieval was mainly based on locality description of herbarium specimens and the diaries of Ádám Boros and László Vajda about their field trips (BOROS 1915-1971, VAJDA 1933-1978) as well as published records (BOROS 1968, ORBÁN and VAJDA 1983). Nomenclature follows GROLLE and LONG (2000), SÖDERSTRÖM et al. (2002) for liverworts and hornworts and CORLEY et al. (1981) and CORLEY and CRUNDWELL (1991) for mosses with amendments according to recent publications, e.g. KOPERSKI et al. (2000). The European distribution of the species is given according to DULL (1983, 1984, 1985, 1992) and SÖDERSTRÖM et al. (2002). Estimation of population size is sometimes difficult in bryophytes and may depend on special features of the taxa in question (for Pyramidula tetragona, e.g., see PAPP et al. 2000, 2002). For epiphytic and epixylic species (e.g. Dicranum viride), it seems appropriate to count the trees colonised as individuals, since destruction of the phorophyte or substrate will affect all plants growing on it. Therefore, counting the individual bryophyte plants or cushions on each tree would lead to an overestimation of population size and to an underestimation of threat. Information about the habitat demands of the species is summarised according to BOROS (1968), ORBÁN and VAJDA (1983) and field experience of the authors. RESULTS Hepaticae Asterella saccata (WAHLENB.) A. Evans is a xerophytic, subcontinental species. It lives in calcareous open grasslands. It is vulnerable in Europe according to the RDB. Old occurrences confirmed: Budapest County, Budapest, Buda Mts, Remete Hill, Máriaremete, southern slope of the hill, on soil in limestone open grassland, above a cave (N 47° 33.668', E 18° 55.907') and along the footpath to the top marked by blue colour (N 47° 33.671', E 18° 55.633'), ca 380 m a. s. [., 22.04.2001. and 24.03.2002. leg. and det. Erzberger, P. and 27.03.2002, leg. and det. Erzberger, P. and Papp, B. About 10 patches of 10 x 10 cm

2 were found. Earlier data from here: 02.05.1921 and 09.04.1922, leg. and det. Gyôrffy, I., 28.03.1926. leg. and det. Boros, Á. and Degen, Á., 22.03.1934, leg. and det. Szepesfalvy, J. - Fejér County, Vértes Mts, Zuppa Hill, Szárliget, southwestern slope of the hill, on soil in limestone open grassland (N 47° 30.382', E 18° 30.889'), ca 380 m a. s. 1., 04.04.2002, leg. and det. Erzberger, P., Papp, B. and Szurdoki, E. 3-4 patches of 10 x 10 cm

2 were discovered. Earlier data from here: 14.05.1942 and 18.04.1948, leg. and det. Boros, Á. - Fejér County, Vértes Mts, Lóingató Hill, Óbarok (Bicske), western slope of the hill, on soil in open limestone grassland (N47° 30' 36.0", E 18° 33' 42.1" and N 47° 30' 45.1", E 18° 33' 28.2"), ca 260-290 m a. s. 1., 17.04.2003, leg. and det. Erzberger, P. and Papp, B. About 60 patches of 10 x 10 cm

2 were found in two places. Earlier data from here: 07.04.1940, leg. and det. Boros Á. - Fejér County, Vértes Mts, Szóló-kő, Csákvár, eastern slope of the hill, on soil in open limestone grassland (N 47° 22' 55.5", E 18° 26' 26.5"), ca 240 m a. s. 1., 19.04.2003, leg. and det. Papp, B. and Erzberger, P. About