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3.
Rhizocarpon geographicum [map-like]. |
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The
Norwegians call this kartlav (map lichen). These chartreuse
yellow and black lichens are abundant all over the mountainous
world, and their species are often very difficult to distinguish
from each other. They are extremely slow growing, and are used by
geologists to date the recession of glaciers and to ascertain the
age and the growth curves of the lichens themselves. |
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4.
Flavocetraria (Cetraria) cucullata [hooded]. |
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An
erect-foliose lichen growing loose on the soil of the tundra or
caught up in masses of dry sedge leaves. The pale yellow thallus is
flat, without a distinction between the upper and lower cortex, and
the edges are curved inward and not flat as in A. nivalis,
with which it often grows. A sure field character is the purple
base of the thallus. These species never fruit, at least in our
region. |
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