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Cladonia pleurota is an “usnic” species, meaning it has usnic acid and therefore should have a distinctly yellowish hue, along with bright red apothecia or at least tiny red dots scattered around the cup rims. Granted, these red pycnidia can sometimes be inconspicuous, and reflected light from a bright blue sky can make an usnic species look bluish.
Do you happen to have lye and bleach lying around the house? You can test for usnic acid directly on one of these things by placing a fragment in a piece of tissue, put a drop of lye on it, then a drop of bleach. Positive reaction (presence of usnic acid) is indicated by golden color bleeding away from the fragment into the tissue. The color reaction is permanent. Be warned that lichens are very hydrophobic and may require some convincing to actually absorb the reagents.
Created: 2009-04-22 17:25:09 EDT (-0400)
Last modified: 2009-04-22 17:25:09 EDT (-0400)
Viewed: 60 times, last viewed: 2016-10-28 13:34:21 EDT (-0400)