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Rhodobryum ontariense (Kindb.) Kindb. (Bryaceae, Bryophyta) is a rare moss,  only recently discovered in Serbia (at Deliblatska Sands). After a revision  of the genus Rhodobryum in Serbia, it was concluded that all high-mountain  records belong to R. roseum, while R. ontariense is confined to the one known  locality at Deliblatska Sands. It is listed in the bryophyte red-list of  Serbia and Montenegro. Within the single known locality we have counted 15  small sub-populations over a total surface area of 6 hectares. The species is  always in sterile condition and has been recorded only on dunes exposed to  the north, at the edge of shrub-grassland transition interspersed with  fragments of steppe vegetation. No propagules are known. This raised the  question of whether the population was once continuous, or whether vectors  exist that spread detached plants or fragments to establish new  subpopulations. To answer this question an isozyme analysis was performed to  estimate the genetic structure of this isolated population. Based on the  isozyme forms of superoxide dismutase and peroxidase at least six haplotypes  were determined within the population. It can be concluded that the present  patches of the moss do not derive from one subpopulation. Some kind of  short-distance dispersal exists, but it remains unclear what structures act  as propagules and what is the vector for them

Genetic structure of the rare moss species Rhodobryum ontariense in Vojvodina (Serbia) as inferred by isozymes