Massive ↔ Encrusting
Massive refers to colonies which are solid with roughly similar dimensions in all directions (e.g. p.16 of the Coral Finder). They may also be described as domed or mound-shaped. If colonies form lumpy surfaces they may be called sub-massive. As colonies become flatter, they are termed thick encrusting or encrusting (e.g. p. 17 of the Coral Finder).