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General Appearance: Medium-sized thallus with numerous thin, irregular lobes which stand up from. the bark. The color varies from tan to gray to green but is most often pale greenish-tan when dry and pale green when wet Individual thalli 3-10 cm (1-4 in) broad. |
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Thallus: Foliose, composed of broad branching sheets with
numerous up-curved lobes; the individual lobes 2-5 mm. (.OS-.20 in) broad;
thin, papery, less than I mm thick; often with ragged margins.
Upper surface smooth, dull, sometimes with inconspicuous wrinkles;
pale, greenish-gray to tan when dry, becoming green to olive or greenish-gray
or tan when wet. Lower surface smooth, shiny, irregularly mottled
brown and white; lacking rhizines.
Apothecia: Lacking. Soredia: (Fig. A) Often present, usually at the margins of the lobes. Isidia: (Fig. B) Sometimes present, usually developing from soralia. Comments: This is one of the most variable and non-descript of foliose lichens. It is quite common. The color is highly variable. The distinguishing features include abundant, irregular paper-thin upright lobes with ragged margins and a hairless, mottled undersurface.
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