Pavona decussata
A variant of Pavona (cactus / potato chip coral) (Pavona cactus)

Photo: Benzoni, F. · CC BY 3.0
A bifacial plating form with thicker, broader fronds sometimes sold under its own species name alongside P. cactus.
Other SPS Corals variants
Green Cactus PavonaPavona maldivensis (encrusting)ORA Mint PavonaBiota Mint PavonaWWC Emerald PavonaWWC Golden PavonaWWC Copper PavonaFreak Hair PavonaNeon Green PavonaNeon Green Encrusting PavonaBlue PavonaPurple PavonaOrange Pavona (maldivensis)Metallic Orange Pavona maldivensisJack O Lantern Pavona maldivensis