Day 140: Several varieties of Lung Lichen grow in abundance in the lowlands of the rainy Pacific Northwest. Lobaria oregana is one of the most common; in fact, one source states that in an optimum habitat, it may attain a biomass equivalent to 1 ton per hectare. This species can be distinguished by its unique colour and a lavish fringe of lobules embellishing its margins. Like other Lobarias, Lettuce Lung is pollution-sensitive, and thrives in the clear air of old-growth forest. Generally found on coniferous trees, it may also colonize deciduous species.
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