Haleiwa Trench, Oahu, 20 feet

Tentative ID, Kewalo, Oahu, 50 feet

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Puako, Hawaii, 20 feet 

Rare at scuba depths found as encrusting vertical sheets or small mounds.  Pit-like calices are tightly packed and surrounded by strong orderly septa.  Brown with pale centers.  Bewick Coral is mottled with irregular septa.  Hawaii & the Indo-Pacific.