Also called clustering anemone, pink-tipped green anemone or surf anemone.
Look for pale green tentacles with pinkish or purple tips. They are found in colonies of small individuals (up to 3 inches across) covering large areas of sand or rocks.
They attach to rocks at or below the surface, but sand seems to be important for them to colonize. If you look closely, you may see one of the anemones splitting in half, making two identical anemones where there was once just one.
Pacific Wonder Tracker 
Maximum size to about 3 inches across. The larger sizes mentioned in the literature are from a more recently described, solitary species (Anthopleura sola)
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Greg, thanks for the clarification. Anemones can be tricky to identify, especially when they are closed. Does the solitary species have the same characteristics as the colonized species, only larger and found as singles?
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