It's a fungus...It's an alga...No, it's-
Lichen
From Wikipedia, the free encyclopedia
consisting of a symbiotic association of a fungus (the mycobiont) with a photosynthetic partner
(the photobiont or phycobiont), usually either a green alga (commonly Trebouxia) or
cyanobacterium (commonly Nostoc).[3]
The morphology, physiology and biochemistry of lichens are very different
from those of the isolated fungus and alga in culture.
Lichens occur in some of the most extreme environments on Earth—
arctic tundra, hot deserts, rocky coasts, and toxic slag heaps...."
...not to mention the state of Indiana.
What a catchy title! I've taken so many pictures of fungus and lichen and moss and little unknown things growing on trees--I think they are so neat!
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