307 PHYTOLOGIA BALCANICA 13 (3): 307–310, Sofia, 2007 A contribution to the Bulgarian bryoflora Petra Hájková 1,2 , Vítězslav Plášek 3 & Michal Hájek 1,2 1 Institute of Botany and Zoology, Faculty of Science, Masaryk University, 2 Kotlářská St., Brno, CZ-611 37, Czech Republic, e-mail: buriana@sci.muni.cz, hajek@sci.muni.cz 2 Department of Ecology, Institute of Botany, Academy of Science of the Czech Republic, 3b Poříčí St., Brno, CZ-603 00, Czech Republic 3 Department of Biology and Ecology, University of Ostrava,10 Chittussiho St., Ostrava, CZ-710 00, Czech Republic, e-mail: vita.plasek@seznam.cz Received: April 30, 2007 ▷ Accepted: May 28, 2007 Abstract. Dicranella staphylina and Gymnocolea inflata have been recorded as species new to Bulgaria. Dicranella staphylina is a recently described species widespread in the Northwestern Europe. It prefers open soils in different habitats. In Bulgaria, it occupies a disturbed open calcareous spring in Mt Lozenska. It was accompanied by Bryum klinggraeffii, Eucladium verticillatum and Pohlia wahlenbergii, which have been also reported as new species for this floristic region (Mt Sredna Gora – Western). Gymnocolea inflata, a common bog species in the Northern, Western and Central Europe, has been found in an alpine spring fen fed by extremely acid and mineral-poor water in the Rila Mts. It was accompanied by Aulacomnium palustre, Polytrichum commune, Sphagnum compactum, S. russowii, Straminergon stramineum, and fen sedges. Calliergon richardsonii and Meesia triquetra are species of reported occurrence in the current checklist of Bulgarian bryophytes, to be confirmed by herbarium vouchers. Since these species have not been found during an extensive study of the Bulgarian mires, we revised the specimens and found that they have been incorrectly determined. The occurrence of these boreal species in Bulgaria is therefore uncertain. Key words: Bryophyte, Calliergon richardsonii, Dicranella staphylina, fen, Gymnocolea inflata, herbarium revision, Meesia triquetra, spring, wetlands Introduction Since the publication date of the new checklist of Bulgarian mosses (Natcheva & Ganeva 2005) five new species have been found on the Bulgarian territory: Scorpidium cossonii (Schimp.) Hedenäs, Meesia longiseta Hedw., Amblyodon dealbatus (Hedw.) P. Beauv., Campyliadelphus elodes (Lindb.) Kanda and Bryum klinggraeffii Schimp. (Blockeel & al. 2006a, b; Natcheva & Ganeva 2007). In this paper, we present the following new species for the Bulgarian bryoflora: Dicranella staphylina H. Whitehouse and Gymnocolea inflata (Huds.) Dumort. They were found in 2005 and 2002, respectively, during our extensive field re- search of fen and wet-meadow vegetation. The specimens of both species are kept in the private herbarium of Petra Hájková and in SOM in Sofia. Our further aim in this paper is to present the re- sults of the herbarium specimen revision, which bring about some changes in the checklist of Bulgarian bry- ophytes. Occurrence of Calliergon richardsonii (Mitt.) Kindb. and Meesia triquetra (Jolycl.) Ångstr. in Bulgaria has proved uncertain, because of the misidentification of specimens that were to evidence it. The aim of this paper is to furnish details about these changes. New species for the Bulgarian flora Dicranella staphylina H. Whitehouse Mt Sredna Gora (Western): Mt Lozenska, near the foot- path ca 700 m above the Lozen village, in a disturbed calcareous spring, 920 m, 27.06.2005, 23°29'01"E,