From the Aims Website:
Description: Colonies are hemispherical to flat. Valleys are sinuous or straight, averaging 35 millimetres wide and are usually separated by a narrow groove. Walls have a thick fleshy appearance. Septa are thick and have large teeth. Columellae are usually in two rows.
Color: Brown, green or red, usually with contrasting valleys and walls.
Similar Species: Symphyllia radians, which has smaller, straighter valleys. See also S. hassi and Lobophyllia flabelliformis.