Day 139: These two photos were taken only three days apart, and they point up one of the issues lichenologists have to face when they're trying to make an identification. A specimen can look very different depending on whether it's wet or dry. Lobaria pulmonaria (Lung Lichen), a common species on Mount Rainier National Park's wet west side, is known for its bright green colour and the ridges which texture its lobes. However, when it dries out, it appears almost grey. A rain shower is all it needs to perk it back up, though. Moisture settles into the network on its upper surface and quickly revitalizes the algae which provide its distinctive hue.
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