365Caws is now in its 14th year of publication, and was originally intended to end after 365 days. It has sometimes been difficult for me to find new material, particularly during the winter months, but now as I enter my own twilight years, I cannot guarantee that I will be able to provide daily posts. It is my hope that along the way I may have inspired someone to a greater curiosity about the natural world. If so, I can rest, content in the knowledge that my work here has been done.
Tuesday, April 7, 2015
Xanthoria Polycarpa, Sunburst Lichen
Day 176: From the Latin "xanthus" meaning "yellow," the Xanthorias are a very distinctive genus of foliose lichen and, at least in the Pacific Northwest, are most commonly found growing on hardwood bark, generally in sunny, open locations. Xanthorias also colonize on rock. Their colour is striking, and often gives rise to expressions of repugnance in the uninitiated, on the order of, "Ewwww! What's that orange stuff all over the trees?" On closer examination, the structures of the lichen become apparent: a foliose thallus dotted with raised apothecial disks. Xanthoria polycarpa occurs farther inland than the very similar X. parietina, although both are primarily coastal species. X. parietina is not known to occur in Washington.
Labels:
Graham,
Sunburst lichen,
Xanthoria polycarpa
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