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Archive for March 18, 2014

Usnea Photo Mis-identified

email-possible Usnea 036Thanks to the readers of my blog, more knowledgeable than I, who made me aware that the photograph of the lichen in today’s post is of a lichen in the genus Ramalina. While Usnea does bear a resemblance to Ramalina, Usnea’s rounded branches are more thread-like than the flattened branches of Ramalina. Thanks to Tom Stearns, Peggy Willey and Jean Bergstrom for their sharp eyes. (Photo: Usnea (circled in red) is surrounded by Ramalina.

Usnea – Old Man’s Beard

3-18-14 lichen 014This lichen, and other members of the Usnea genus, can often be found growing on the branches of less than healthy trees in the Northeast. The algal component of these algae/fungi phenomena takes advantage of the lack of leaves on dying trees by using the available sunlight to photosynthesize. Usnea, also known as Old Man’s Beard, grows in little hair-like tufts and has a diagnostic pale yellow, elastic central cord. In addition to being an indicator of air pollution (its size is greatly decreased if there is pollution), Usnea has been used by herbalists as an immune system tonic for hundreds of years.

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