Steve Nicholls / Lava field with growth of Dotted polypody fern (Polypodium pellucidum), Kilauea, Hawaii, USA, August 2008
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Duncan Mcewan / Common polypody fern (Polypodium vulgare) Sori on underside of frond, Scotland
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Duncan Mcewan / Common polypody fern (Polypodium vulgare) sori on underside of frond, Scotland
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Laurie Campbell / Common polypody fern (Polypodium vulgare) growing on boulder by stream, Ardnamurchan Peninsula, Argyll, Scotland, January 2009
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SCOTLAND: The Big Picture / Common polypody (Polypodium vulgare) growing in oak woodland, Airundle National Nature Reserve, Ardnamurchan Peninsula, Lochaber, Scotland, UK, June.
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SCOTLAND: The Big Picture / Common polypody (Polypodium vulgare) growing on the branch of an Oak tree (Quercus), Airundle National Nature Reserve, Ardnamurchan Peninsula, Lochaber, Scotland, UK, June.
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SCOTLAND: The Big Picture / Common polypody (Polypodium vulgare) growing on the branch of an Oak tree (Quercus), Airundle National Nature Reserve, Ardnamurchan Peninsula, Lochaber, Scotland, UK, June.
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Chris Mattison / Common polypody fern (Polypodium vulgare) frond with immature spores
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Chris Mattison / Common Polypody fern (Polypodium vulgare) underside of frond showing ripe sporangia (spore capsules). Monmouthshire, Wales, UK, December.
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Chris Mattison / RF - Common Polypody fern (Polypodium vulgare) underside of frond showing ripe sporangia (spore capsules). Monmouthshire, Wales, UK, December. (This image may be licensed either as rights managed or...
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Sebastian Kennerknecht / Common Maidenhair Fern (Adiantum aethiopicum), Rock Polypody (Polypodium calirhiza), and Lady Fern (Athyrium filix-femina), Bouverie Preserve, Glen Ellen, California
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Alex Hyde / Water cascading over naturally formed tufa dam. Tufa is a kind of limestone, formed from the precipitation of carbonate minerals which builds up around mosses and water plants to form a solid limeston...
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Floris van Breugel / Common polypody fern / fiddlehead (Polypodium vulgare) fronds unfurling, Olympic National Park, Washington, USA. May 2012.
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Piotr Naskrecki / Rock Polypody (Polypodium virginianum) leaf, Massachusetts
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Steve Nicholls / Eruption of Kilauea volcano with lava fields in foreground and growth of Dotted polypody fern (Polypodium pellucidum), Hawaii, USA, August 2008
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Alan Watson / Unfurling frond of Common Polypody fern (Polypodium vulgare) on an Oak tree (Quercus petraea) in temperate forest, Killarney National Park, County Kerry, Republic of Ireland, Europe
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Alan Watson / Polypody ferns (Polypodium vulgare) and Moss on the trunk of Oak tree (Quercus petraea) Tomies Wood, Killarney National Park, County Kerry, Republic of Ireland, Europe
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Jerry Monkman / Common polypody fern / fiddlehead {Polypodium vulgare} frond unfurling, Boxford, Massachusetts, USA
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Jerry Monkman / Common polypody fern / fiddlehead {Polypodium vulgare} frond unfurling, Boxford, Massachusetts, USA
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Duncan Mcewan / Polypody fern on fallen tree {Polypodium vulgare}, Oakwood, Inverness-shire, Scotland
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Philippe Clement / Frond of Common polypody fern {Polypodium vulgare} showing spores on underside, Belgium
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Philippe Clement / Common polypody fern {Polypodium vulgare} in woodland, Belgium
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Philippe Clement / Frond of Common polypody fern {Polypodium vulgare} showing spores on underside, Belgium
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Jason Smalley / Lichen and polypody fern covered oak near Laggan Bay, Isle of Mull, Scotland, UK.
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Jason Smalley / Lichen and polypody fern covered oak near Laggan Bay, Isle of Mull, Scotland, UK.
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Jason Smalley / lichen and polypody fern covered oak near Laggan Bay, Isle of Mull, Scotland, UK.
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Philippe Clement / Common polypody {Polypodium vulgare}close-up of frond, La Brenne, France.
Niall Benvie / Common polypody fern {Polypodium vulgare} and moss, Slitere NP, Latvia
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Duncan Mcewan / Common polypody fern (Polypodium vulgare) on oak branch. Scotland, UK, Europe
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Mike Read / Pedunculate oak (Quercus robur) stunted trees and moss covered boulders. Wistman's Wood National Nature Reserve, Dartmoor National Park, Devon, UK. October.
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Mike Read / Pedunculate oak (Quercus robur) stunted trees and moss covered boulders. Wistman's Wood National Nature Reserve, Dartmoor National Park, Devon, UK. October.
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Mike Read / Moss covered boulders and tree trunks of ancient Pedunculate oak (Quercus robur). Wistman's Wood National Nature Reserve, Dartmoor National Park, Devon, UK. November.
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Mike Read / Moss covered boulders and tree trunks of ancient Pedunculate oak (Quercus robur). Wistman's Wood National Nature Reserve, Dartmoor National Park, Devon, UK. November.
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Paul Harcourt Davies / Common polypody (Polypodium vulgare) underside of frond to show sori, capsules that are collections of sporangia that contain the spores, Umbria, Italy. December.
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Chris Mattison / Common polypody fern (Polypodium vulgare) with ripe spore clusters (sori) on underside of fronds.
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Nick Upton / Common polypody (Polypodium vulgare) fern frond with maturing sporangia under its leaves in damp woodland, Lower Woods, Gloucestershire, UK, October.