Image PC_PC_MA001. Tunicate colonies of Didemnum vexillum encrusting rocky surface; associated with algae. Plum Cove, MA (42 deg 40.450 min N lat, 70 deg 39.883 min W lon. Water depth 3.5-4.5 m. June 24, 2012. Identified by P. Colarusso (USEPA). Photo credit: P. Colarusso (USEPA). Map location no. 106 Click here to download image.