B. Papp szerk.: Studia Botanica Hungarica 39. 2008 (Budapest, 2008)

Erzberger, P.; Schröder, W.: The genus Schistidium (Grimmiaceae, Musci) in Hungary

After the preliminary treatment of Scbistidium in the checklist of Hungarian bryophytes (ERZBERGER and PAPP 2004), the present work aims at closing this gap by the revision of a large number of specimens of this genus. Apart from answering the question of which taxa occur in Hungary, their distribution in the floristical regions of the country as defined by BOROS ( 1968) is assessed and mapped. For each taxon, selected morphological characters are described, based on observations in Hungarian material and the literature, and illustrated. The authors propose a determination key for Scbistidium in Hungary. Habitat preference and distribution in Hungary are discussed and compared with the results from other countries. MATERIAL AND METHODS All specimens collected in Hungary and labelled Scbistidium (or synonyms) in the bryophyte herbarium of the Hungarian Natural History Museum (BP), the herbarium of the Eszterházy College in Eger (EGR), and of some private herbaria (P. Odor, Budapest, P. Szűcs, Almásfüzitő) as well as the recent collections of the first author were examined by light microscopy and revised, apart from incomplete or non-fruiting matetial. Drawings of some morphological features were achieved with a Leitz drawing apparatus. In order to observe the pattern of the exothecial cells and stomata in the basal part of the capsule, sporophytes were emptied and well soaked in 2% KOH, sometimes by boiling for some seconds with a cigarette lighter to remove air bubbles, and then cut in half using a razor blade. In order to completely flatten the capsule wall, an additional longitudinal cut of about half of the capsule length was applied to the basal part of each half. In randomly selected specimens measurements of urn length and width were taken from emptied capsules soaked in 2% KOH. From these data, the ratio length/width was computed, and means and standatd errors were also evaluated for each taxon. Distribution maps wete prepared on the basis of the Central European mapping scheme (NlKLFELD 1971). Open circles represent collections before 1977, closed circles after that year. Frequency of taxa is estimated by the number of different growth sites as noted on the specimen labels. Nomenclature of bryophytes follows ERZBERGER and PAPP (2004) with the exception of Scbistidium, Bryum moravicum Podb. (= B. laevifilum Syed) and B. kunzei Hornsch., where HILL et al. (2006) is followed.