It's a mixture of alga and fungus
Its color changes depending on season and shade
And it won't grow on a tree that is trunkless.
(Make sure you read the linked article, it has one of the best descriptions of identifying lichens that I have found, including a brief but informative vocabulary section.)
Location: North Sebastian Conservation Area
Sources: https://lucec.loyno.edu/natural-history-writings/bark-rash-lichen-0
Photo and text © 2026 Dee Fairbanks Simpson
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