Isophyllia is a colonial coral. Budding is always intracalicular, occurring inside the oral disc of the polyp, within the whorl of tentacles. The corallites are meandroid, that is, they are linked in a short series of up to five centres. The individual corallites are medium-sized, being 2.5 to 5 mm (0.1 to 0.2 in) in diameter and up to 6 mm (0.2 in) high. There are three or more cycles of septa in each corallite, all equal in size. A narrow costate coenosteum separates the corallites.[2]