Definitions
from The Century Dictionary.
- Pertaining to, or derived from, Usnea or other licliens.
from the GNU version of the Collaborative International Dictionary of English.
- adjective (Chem.) Pertaining to, or designating, a complex acid obtained, as a yellow crystalline substance, from certain genera of lichens (
Usnea ,Parmelia , etc.).
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective of or relating to
usnic acid
Etymologies
Sorry, no etymologies found.
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Examples
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The accumulation of the protective pigment parietin in Xanthoria parietina is induced specifically by UV-B radiation [124], while in Cladonia uncialis and Cladina rangiferina only UV-A radiation had a stimulating effect on the accumulation of usnic acid and atranorin, respectively.
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Usnic acid levels in old lichen specimens from herbariums show lower levels of usnic acid than recent specimens from the same place, indicating that UV-B levels were lower in recent history.
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Certain species of lichens (e.g. Usnea aurantiaco-atra) produce higher levels of usnic acid when levels of UV-B are higher.
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As most have figured out, there's no reason to believe usnic acid is the source of elk fatality found in the lichen.
grouse Diary Entry grouse 2004
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One final one, let me mention as well, usnic acid.
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