Distribution map of Dryopteris cambrensis in Poland (in regions) (source: Key to identification and descriptions of species of Buckler-ferns (Dryopteris Adans.) occurring in Poland – In: E. Szczęśniak,. E. Gola (eds), Genus Dryopteris Adans. in Poland. and https://commons.wikimedia.org/wiki/File:Poland_location_map_white.svg). 
Natural occurence: dark green - common species (occuring at least in half of plots 10x10 km); green - not rare (present in &gt;10 of plots 10x10 km); light green - rare species (10 or fewer number of plots 10x10 km; including historical)
Own work
Kenraiz