Nick Upton / Clump of Hart's-tongue fern (Phyllitis / Asplenium scolopendrium) in woodland understorey after recent rain, Cornwall, UK, May.

Nick Upton / Green-winged orchid (Orchis / Anacamptis morio) flowering in a traditional hay meadow meadow, Wiltshire UK, May.

Chris Mattison / Hart's Tongue Fern (Asplenium scolopendrium) growing on limestone pavement, Gait Barrows, Lancashire, England, UK, July.

Chris Mattison / Hart's tongue fern (Asplenium scolopendrium), new fronds emerging from crevice in limestone pavement, Lancashire, UK. April.

Chris Mattison / Hart's tongue fern (Asplenium scolopendrium), new fronds emerging from crevice in limestone pavement, Lancashire, UK. April.

Ross Hoddinott / Harts tongue fern (Phyllitis scolopendrium) leaf unfurling, Cornwall, UK, May.

Kirkendall-Spring / Petroglyph at Petroglyph Lake in Hart Mountain National Antelope Refuge, Oregon, May 2013.

Tim Fitzharris / Pine River, Hart Ranges, British Columbia, Canada

Yva Momatiuk & John Eastcott / Cumulus clouds over prairie, Hart Mountain National Wildlife Refuge, Oregon

Philippe Clement / Hart's Tongue fern (Asplenium scolopendrium) fronds unfurling in spring, Luxembourg, Europe.

Alan Watson / Yew tree (Taxus baccata) and Hart's tongue ferns (Phyllitis scolopendrium) in temperate forest, Killarney National Park, County Kerry, Republic of Ireland. Europe

Wild Wonders of Europe / Hermansen / Hart's tongue fern (Asplenium scolopendrium) growing between rocks, Burren National Park, County Clare, Republic of Ireland, June.