I got this as part of my coral order, called an encrusting Hogwarts. Any better ideas of the exact type. I was thinking something in the chalice, mycedium family.
Your assessment that it is a Mycedium sp. is correct. One way to distinguish the difference between an Echinophyllia sp. and a Mycedium sp. is that the eyes of a Mycedium sp. always point outward toward the perimeter. And the longitudinal ridges are a give away also.