Jack Dykinga / Douglas firs (Pseudotsuga menziesii) in 'Wall Street' Canyon. Bryce Canyon National Park, Utah, USA, October.
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Floris van Breugel / Ponderosa pine (Pinus ponderosa) grove at twilight under a heavy snowfall, Deschutes National Forest, Oregon, USA. December 2009
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Floris van Breugel / Ponderosa Pine trees (Pinus ponderosa) coated in frost, during heavy snowfall, Deschutes National Forest, Oregon, USA, December 2009
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Floris van Breugel / Ponderosa pines (Pinus ponderosa) in winter snow, near Sisters, Oregon, USA. December 2009.
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Rob Tilley / Close up of bark of Sitka Spruce tree {Picea sitchensis} in temperate coastal rainforest, Cape Perpetua, Siuslaw NF, Oregon, USA
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Rob Tilley / Sitka Spruce trees {Picea sitchensis} in temperate coastal rainforest, Cape Perpetua, Siuslaw NF, Oregon, USA
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Rob Tilley / Sitka Spruce trees {Picea sitchensis} in temperate coastal rainforest, Cape Perpetua, Siuslaw NF, Oregon, USA