| Summary: | This paper reports identification of serpentine fern, Asplenium adulterinum, in the South-Eastern Carpathians, Mehedinţi Plateau, on serpentine substrate, in a vegetative context specific to these rocks: Cheilantho marantae-Asplenietum cuneifolii Pinto da Silva 1965 ap. de Foucault 1986 association. In 2016 it was identified the Asplenium adulterinum fern on "Dealul cu zgură", to Obârsia Cloşani village. The perimeter under consideration is an enclave (rocks and serpentine screes) in a Quercus dalechampii and Fagus sylvatica forest. About a Threatened Fern, Asplenium adulterinum Milde, has recently published a study that analyzes all previous literature and herbarium material and indicates three new site for the species in Romania. Nevertheless, the three site are on limestone rocks, so the presence of the species in these site is doubtful.
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