Juan Manuel Borrero / Tree ferns (Cyatheales) in humid forest. Natural Monument of Caldeira Velha, Ribeira Grande, Sao Miguel Island, Azores, Portugal.

Juan Manuel Borrero / Tree ferns (Cyatheales) in humid laurisilva forest. Natural Monument of Caldeira Velha, Ribeira Grande, Sao Miguel Island, Azores, Portugal.

Juan Manuel Borrero / Tree ferns (Cyatheales) in laurisilva forest. Natural Monument of Caldeira Velha, Ribeira Grande, Sao Miguel Island, Azores, Portugal.

Duncan Murrell / Tree ferns on the Mangamate Track in Whirinaki Forest Park, North Island, New Zealand.

Duncan Murrell / Tree ferns on the Mangamate Track in Whirinaki Forest Park, North Island, New Zealand.

Duncan Murrell / Tree ferns on the Mangamate Track in Whirinaki Forest Park, North Island, New Zealand.

Duncan Murrell / Tree ferns in Whirinaki Forest Park, North Island, New Zealand.

Duncan Murrell / Tree ferns in Whirinaki Forest Park, North Island, New Zealand.

Duncan Murrell / Tree ferns, Lake Waikaremoana, Te Urewera National Park, North Island, New Zealand.

Nick Hawkins / Tree ferns and rainforest. Cocos Island National Park, Costa Rica.

Staffan Widstrand / Wild Wonders of China / Tree ferns (Cyatheales) and other trees and vegetation in the montane rainforest, Tongbiguan Nature Reserve, Dehong Prefecture, Yunnan province, China, May.

Staffan Widstrand / Wild Wonders of China / Tree ferns, Cyatheales, and other trees and vegetation in the montane rainforest, Tongbiguan Nature Reserve, Dehong Prefecture, Yunnan province, China. May

Staffan Widstrand / Wild Wonders of China / Tree ferns (Cyatheales) in the montane rainforest, Tongbiguan Nature Reserve, Dehong prefecture, Yunnan province, China, May.

Joao Burini / Cyathea fern surrounded by various palm species, Carlos Botelho State Park, Sao Paulo, Atlantic Forest South-East Reserves, UNESCO World Heritage Site, Brazil.

Adrian Davies / Tree fern (Cyathea princeps) frond unfurling, cultivated specimen, occurs in Mexico / Central America.

Kirkendall-Spring / Hawaii tree fern / Hapu'u (Cibotium glaucum) frond unfurling, Hawaii Volcanoes National Park, Hawaii. December 2016.

Staffan Widstrand / Tree fern (Cyatheales sp) silhouetted in montane rainforest, near FakFak, Mainland New Guinea, Western Papua, Indonesian New Guinea

Philippe Clement / Soft tree ferns / Man ferns (Dicksonia antarctica) evergreen tree fern native to eastern Australia

Philippe Clement / Soft tree ferns / Man ferns (Dicksonia antarctica) evergreen tree fern native to eastern Australia

Cyril Ruoso / Rough tree fern (Cythea sp) Yakushima Island UNESCO World Heritage Site, Japan.

Doug Wechsler / Tree ferns in cloud forest, Province Zamora-Chinchipe, Tapichalaca Biological Reserve, Ecuador, March

Tim Laman / Tree ferns (Dicksonia) and alpine grassland at Tari Gap, Papua New Guinea.

Tim Laman / Tree fern (Dicksonia) forest and alpine grassland in early morning fog. Near Lake Habbema, Jayawijaya Mountains, New Guinea. June 2010

Tim Laman / Tree ferns (Dicksonia sp) growing in the alpine grassland near Lake Habbema, Jayawijaya Mountains, Papua New Guinea.

Tim Laman / Tree Ferns (Dicksonia sp.) in the mist. New Guinea.

Tim Laman / Bird of Paradise researcher Edwin Scholes and Indonesian guide Untu walk through morning fog toward a Tree fern (Dicksonia) forest by Lake Habbema, Jayawijaya Range, New Guinea June 2010.

Tim Laman / Tree fern (Dicksonia) forest in alpine grassland at approx. 3300 m elevation in the Jayawijaya Mountains, New Guinea.

Tim Laman / Alpine grasslands with tree ferns near Lake Habbema, Jayawijaya Mountains, Papua, Indonesia.

Tim Laman / Rock outcroppings among Tree fern (Dicksonia) forest in alpine zone at approx. 3300 m elevation. Jayawijaya Mountains, New Guinea. June 2010.

Juan Carlos Munoz / Arborescent ferns (Cyatheaceae), Kells Bay Gardens, Iveragh Peninsula, County Kerry, Republic of Ireland. September.

Juan Carlos Munoz / Arborescent ferns (Cyatheaceae), Kells Bay Gardens, Iveragh Peninsula, County Kerry, Republic of Ireland. September.

Juan Carlos Munoz / Arborescent ferns (Cyatheaceae) in Kells Bay Gardens, Ring of Kerry, Iveragh Peninsula, County Kerry, Republic of Ireland. September 2015.

Brent Stephenson / Wheki / Rough tree fern (Dicksonia squarrosa) frond unfuling, Ulva Island, Stewart Island, New Zealand, November.

Floris van Breugel / Hawaiian Tree Fern (Cibotium menziesii), Volanoes National Park, Hawaii. July 2011.

Bert Willaert / Tree fern (Cyathea manniana) in the Atewa forest reserve, Ghana.

Bert Willaert / Tree fern (Cyathea manniana) in the Atewa forest reserve, Ghana.

Adrian Davies / Tree Fern (Cyathea cooperi) unfurling frond.

Roland Seitre / Ferns in landscape, Great Fern Provincial Park / Parc des Grandes Fougres Farino, South Province, New Caledonia, August 2012.

Roland Seitre / Ferns in landscape, Great Fern Provincial Park / Parc des Grandes Fougres Farino, South Province, New Caledonia, August 2012.

Tim Laman / Tree Fern forest near Lake Habbema, Jayawijaya Mountains, New Guinea. June 2010

Tim Laman / Tree Fern forest in mist, near Lake Habbema, Jayawijaya Mountains, New Guinea. June 2010

Daniel Heuclin / Giant tree fern (Cyathea intermedia) the biggest fern of the world at 30 metres, New Caledonia. Endemic.

Daniel Heuclin / Giant tree fern (Cyathea intermedia) the biggest fern of the world at 30 metres, New Caledonia. Endemic.

Nick Upton / View of montane rainforest with tree ferns (Cyatheales) Orchid Island, Taiwan

Klaus Nigge / Tree fern (Cyathea sp.) canopy, Mount Apo area, Mindanao, Philippines, August 2006.

Klaus Nigge / Tree fern (Cyathea sp.) leaves, Mount Apo area, Mindanao, Philippines, August 2006.

Klaus Nigge / Tree fern (Cyathea sp.) in rainforest, Kitanglad mountain range, Mindanao, Philippines, February 2006.

Daniel Nunez / Tree ferns (Cyatheaceae) in dense cloud forest, Sierra de las Minas Biosphere Reserve, Zacapa, Guatemala.

Roland Seitre / Hawaiian tree-fern (Cibotium sp.) un-rolling fronds, Volcanoes National Park, Big Island, Hawaii.

Bruce Thomson / Superb lyrebird (Menura novaehollandiae) male in partial display perched in Tree fern (Cyatheales) in wet eucalypt forest, Lakes Entrance Rainforest, Victoria, Australia.

Bruce Thomson / Superb lyrebird (Menura novaehollandiae) male in partial display in profile on ground under Tree ferns (Cyatheales) in wet eucalypt forest, Lakes Entrance Rainforest, Victoria, Australia.

Bruce Thomson / Superb lyrebird (Menura novaehollandiae) male in partial display perched in Tree fern (Cyatheales) in wet eucalypt forest, Lakes Entrance Rainforest, Victoria, Australia.

Bruce Thomson / Superb lyrebird (Menura novaehollandiae) male displaying and calling on ground under Tree ferns (Cyatheales) in wet eucalypt forest, Lakes Entrance Rainforest, Victoria, Australia.

Tim Edwards / Visitor dwarfed by Tree ferns at Southern Entrance to Maungatautari Ecological Island Reserve, North Island, Waikato, New Zealand, July 2019.

Tim Edwards / Black tree ferns (Sphaeropteris medullaris) along Rata track, Maungatautari Ecological Island Reserve, Waikato, North Island, New Zealand.

Tim Edwards / Black tree ferns (Sphaeropteris medullaris) young ferns in understorey, Maungatautari Ecological Island Reserve, Waikato, North Island, New Zealand.

Juergen Freund / Tree fern (Cyatheales) with epicormic growth, damaged in forest fire. Blue Mountains, New South Wales, Australia. February 2020.

Juergen Freund / Australian tree fern (Sphaeropteris cooperi) silhouetted against Milky Way in night sky. Queensland, Australia.

Claudio Contreras / Tree Fern (Cyathea sp.) detail, El Triunfo Biosphere Reserve, Chiapas, southern Mexico, May

David Gallan / Drone shot of burnt Soft tree ferns (Dicksonia antarctica) after a bush fire, Monga National Park, New South Wales, Australia, January 2020.

David Gallan / Drone shot of burnt Soft tree ferns (Dicksonia antarctica) after a bush fire, Monga National Park, New South Wales, Australia, January 2020.

David Gallan / Drone shot of Soft tree ferns (Dicksonia antarctica) in forest, Monga National Park, New South Wales, Australia, 2019.