B. Papp szerk.: Studia Botanica Hungarica 38. 2007 (Budapest, 2007)

Papp, Beáta; Erzberger, Peter: Contributions to the bryophyte flora of Western Stara Planina Mts (E Serbia)

ascendens, Lophozia badensis, L. heterocolpos, L. collaris) and 8 mosses (Amphidium mougeotii, Cynodontium bruntonii, Encalypta ciliata, Grimmia caespiticia, Orthotrichum obtusifolium, Paraleucobryum sauteri, Pseudoleskea saviana, Timmia bavarica) are vulnerable (VU). Three hepatics (Anastrophyllum minutum, Barbilophozia floerkei, Barbilophozia hatcheri) and 13 mosses (Andraea rupestris, Brachytecium geheebii, Hygroamblystegium tenax, Ditrichum pusillum, Isopterygiopsis pulchella, Leptobryum pyriforme, Myurella julacea, Plagiobryum zierii, Pseudoleskea radicosa, Racomitrium sudeticum, Syntrichia virescens, Timmia austriaca) were placed in the category of lower risk (LR) in the national red list of bryophytes. Four mosses (Brachythecium reflexum, B. starkei, Dicranella schreberiana, Philonotis arnellii) are data deficient (DD). It is hoped that the new data presented here are going to improve the knowledge about their distribution. Although our exploration on the Bulgarian side of Midzor peak was very short, 10 species were collected, which are included in the national red list of bryophytes of Bulgaria (NATCHEVA et al. 2006). Of the liverworts, Fossombronia husnotii is critically endangered (CR), and Frullania jackii is endangered (EN). Another liverwort species, Tritomaria exsecta and 5 mosses (Amphidium lapponicum, Encalypta microstoma, Grimmia elatior, Grimmia funalis, Lescuraea saxicola) are vulnerable (VU). Schistidium confertum is in the near threatened or lower risk (LR) and Pohlia longicolla in the data déficient (DD) category. CONCLUSION Though our investigation on the Western Stara Planina Mts covered a relatively small area (surroundings of Midzor peak), we found several redlisted species. The impressive species diversity can be attributed to the special circumstances provided by the bedrock (Permian red sandstone) and climate. Several species, characterized by boreal or arctic-alpine distribution, occur here extrazonally, supported by the special micro- and meso-climate with high precipitation coupled with the high elevations and the fact that the Stara Planina Mts is connected to the Carpathians, and hence it forms a natural pathway for northern species to reach areas