Characters: Colonies are flat or hemispherical, phaceloid or partly flabello-meandroid and are seldom more than 0.5 metres across. Corallites are 40-50 millimetres diameter and are circular to irregular in outline. Primary septa are thick, with three to five long lobed teeth. Columellae are large and usually diffuse. Costae are poorly developed.
Colour: Uniformly dark green or grey with yellowish primary septa.
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