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9.
Xanthoria fallax [deceiving, false]. |
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Abundant on
the moist sides of street trees in the towns, and on country roads
where horses and cattle stir up nitrogenous dust. One of the most
pollution-resistant lichens. Note the underside covered with
soredia. |
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10.
Xanthoria montana [many-fruited]. |
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A small
foliose orange lichen growing on twigs, especially of broadleaf
trees, and on the scars of aspen trunks. Apothecia have bright
orange discs with a thalline margin, and there are no soredia. The
variation from place to place is remarkable, suggesting that
several different species are going under this name. The orange
pigment in Caloplaca and Xanthoria is called
parietin, and if a drop of potassium hydroxide is dropped on the
thallus, it turns deep purple. |
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