| BAS | Bulgarian Academy of Sciences |
| BC | Convention on the Conservation of European Wildlife and Natural Habitats (Bern Convention) |
| BDA | Biological Diversity Act |
| CBD | Convention on Biological Diversity |
| CITES | Convention on International Trade in Endangered Species of Wild Fauna and Flora |
| CR | Critically Endangered |
| DD | Data Deficient |
| EN | Endangered |
| EU | European Union |
| EX | Extinct |
| Fl. | Flowering/spore formation |
| Fr. | Fruiting/ripening of spores/cones |
| HD | Habitats Directive (Directive 92/43/EEC) |
| IBER | Institute of Biodiversity and Ecosystem Research |
| IPA | Important Plant Areas |
| IUCN | International Union for Conservation of Nature (the World Conservation Union) |
| LC | Least Concern |
| MOEW | Ministry of Environment and Water |
| NT | Near Threatened |
| RE | Regionally Extinct |
| VU | Vulnerable |