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15. Lecidea
atrobrunnea [black-brown]. |
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A very
common species growing on granitic rocks. The brown thallus areoles
contrast with the black apothecia, which have a narrow black rim
(proper margin or exciple). When well developed, the thallus also
has a narrow black border (prothallus), which consists only of
fungus tissue, forming a leading edge for future growth. Ranges
from the outer foothills up into the alpine tundra. |
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16.
Cetraria islandica [of Iceland]. |
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An
unattached brown, erect foliose lichen with many marginal
''spines". The underside is pale tan, and has irregular blotches
(pseudocyphellae) where the cortex is lacking. The thallus is very
brittle when dry, as are so many foliose lichens, but when wet it
can be squeezed tightly, releasing some of its moisture but not
being injured. Abundant on alpine tundra but occurring at lower
altitudes on north-facing slopes of ravines. |
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