Wild Wonders of Europe / Tønning / Halerbach / Haupeschbach flowing between large moss covered rocks with Male ferns (Dryopteris filix mas) growing, Beaufort, Mullerthal, Luxembourg, May 2009

David Woodfall / Male Fern (Dryopteris felix mas) in oak woodland, Snowdonia National Park, Wales, UK, June

Chris Mattison / Male fern (Dryopteris filix-mas) Drumnadrochit, Inverness, Scotland, UK, August.

Chris Mattison / Male fern (Dryopteris filix-mas) Drumnadrochit, Inverness, Scotland, UK, August.

Chris Mattison / Limestone oak fern (Gymnocarpium robertianum) and Hazel (Corylus avellana) growing in scree in a limestone dale. Peak District, Derbyshire, UK, May.

Chris Mattison / Limestone oak fern (Gymnocarpium robertianum) and Hazel, (Corylus avellana) growing in scree in a limestone dale. Peak District, Derbyshire, UK, May.

Juan Carlos Munoz / Male fern (Dryopteris filix-mas) in Senda Fluvial del Nansa, Nansa Valley, Cantabria, Spain, Europe. May 2015.

MYN / Niall Benvie / Male fern (Dryopteris filix-mas) Scotland, UK.

Adrian Davies / Scaly male fern (Dryopteris pseudomas) unfurling frond. Surrey, England, UK, May.

Pascal Tordeux / Male fern (Dryopteris filix-mas) medicinal plant against white background.

Alex Hyde / Beech Fern (Phegopteris connectilis), Isle of Mull, Scotland, UK. June.

Chris Mattison / Rigid Buckler fern (Dryopteris villarii) in limestone pavement. Gair Barrows, Lancashire, England, UK, July.