The work presents characteristics of calciphile species from the dendroflora of Bulgaria (107 species), both facultative (77 species) and obligated (30 species) -their systematic structure according to families and genera, division according to biological types and live forms, as well as floristic geo-elements and spreading on vertical belts and floristic regions in Bulgaria. The conservation significance of calciphiles at national and international level has been shown on the basis of referent documents. A systematic list of calciphile species of the Bulgarian dendroflora has been presented.
The name Quercus protoroburoides is validated. It was assigned to a new science representative of the genus Quercus discovered in 1968 by Dipl. Eng. B. Buzov in the valley of river Rilska on the territory of the Rila Mountains, Bulgaria. the taxon was originally named Quercus macranthera subsp. balcanica and subsequently renamed to Quercus protoroburoides. However, it has never been described according to the International Code of Nomenclature for algae, fungi, and plants and, owing to this, the name is invalid and has never been included in any Flora or Key. It differs significantly from the already known members of this genus in Bulgaria and Europe. Information on this taxon will fill a gap in the knowledge of the taxonomic diversity in Quercus.
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