Jack Dykinga / Western sword fern (Polystichum munitum) and Big leaf maple (Acer macrophyllum) trees that are covered with moss, Hoh Temperate Rainforest, Olympic National Park, Washington, USA. June 2017.

Matthias Breiter / Creek flowing into lake in temperate rainforest, Lake Crescent, Olympic National Park, Washington

Matthias Breiter / Waterfall and creek in temperate rainforest, Merriman Falls, Olympic National Park, Washington

John Abbott / Low angle view of trees in the Hoh Rainforest, Hall of Mosses Trail, Olympic National Park, Jefferson County, Washington, USA, June.

Kirkendall-Spring / Camp site at night above Appleton Pass in Olympic National Park, Washington, USA, August 2013.

Floris van Breugel / Late fall colors linger among the mossy trees (Acer macrophyllum) in the Hoh Rainforest in Olympic National Park. Washington, USA. November 2012

Kirkendall-Spring / Trees and sea stacks silhouetted in fog at Point of the Arches in Olympic National Park. Washington, USA, August 2012.

Tim Fitzharris / Ruby Beach, Olympic National Park, Washington

Floris van Breugel / Winter snowstorm with frost covered trees , Hurricane Ridge, Olympic National Park, Washington, USA, February 2012.

Floris van Breugel / Hoar frost coats the edges of ferns in a clearing in Washington's Olympic National Park, USA. December.

Konstantin Mikhailov / Western red cedar tree (Thuja plicata) trunks with moss and fungi, inland temperate rainforest of Olympic National Park, Washington, USA, Western North America, January.

Floris van Breugel / Avalanche lilies (Erythronium montanum) blooming in colourful alpine meadow, with glaciated Mount Olympus behind, Olympic National Park's backcountry Bailey Range, Washington, USA. July 2008.