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Algae is an informal term for a large, diverse group of photosynthetic eukaryotic organisms that are not necessarily closely related, and is thus polyphyletic.

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What kind of lichen is it (no. 2)?

This is a fruiticose lichen, meaning one with a bushy growth habit. They are common in my native state of Texas (USA), where they hang off of oak trees. Your photos look much like them. I have seen ot …
Ray N. Franklin's user avatar