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71.
Thamnolia vermicularis [worm-like]. |
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A very
common, unattached lichen gathering in blowout patches of tundra or
caught in between the stems of grasses and sedges. The thalli
resemble hollow, white icicles, and may be simple or slightly
branched. Apothecia are unknown. Two species are often recognized
that are indistinguishable except that one fluoresces in
ultraviolet light. |
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72.
Umbilicaria americana. |
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A huge
umbilicate lichen up to 8 inches in diameter with a white or
grayish thallus and jet black underside covered with black
rhizinae, abundant on vertical cliffs on north-facing exposures in
the foothills. Minute black dots on the thallus are pycnidia.
Apothecia are very rare, but when present they are convex, black,
and deeply furrowed. Long mistaken for U. vellea, this
lichen was first recognized as distinct in 1994! |
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