Image PC_OGB_MA001. Tunicate colonies of Didemnum vexillum encrusting a rocky surface; associated with algae and possibly Botrylloides violaceus. Old Garden Beach, MA (42 deg 39.50 min N lat, 70 deg 36.30 min W lon. Water depth 6 m. August 25, 2012. Identified by P. Colarusso (USEPA). Photo credit: P. Colarusso (USEPA). Map location no. 104. Click here to download image.