Probably not native wide spreading tree with droopy branches
Looks like a cross between a scorpion and a tick.
Tiny (less than 1/4"), spreading everywhere on old sea lettuce. Each has a tiny reddish orange top.
About 1/2". Was found on sea lettuce, which was pumping out bubbles of oxygen which stuck on the limpet's shell.
About 2" high, brown and white stripes.
Maybe "Parasol Feather Duster" (old names: Demonax medius or Sabella media).
Another one, darker (orange on one side, balck or dark brown on the other).
"Orange Finger Sponge," ID as per Lamb and Hanby p. 68.
Lacy, fine, nearly translucent light brown algae (or possibly seaweed) growing profusely on dock. Clumps 6-12" but hard to tell where one ends and he next one starts because it was so fragile.
"Spaghetti Sponge," ID as per Lamb and Hanby, p. 62.
About 1/2" long, saw several of them in various red/yellow/orange colors speeding along just below the surface of the water.