These little green Fungia plates are dome-shaped. When placing them in your tank, make sure they don't have a bubble caught underneath or else they will die back and possibly get an infection. In general they are 1" in diameter.
While not the most rare plate coral, this is perhaps my favorite coloration. These Fungia plate corals are orange with bright yellow tentacles. In general they are 1.5" to 2" in diameter.