Rhodactis howesii is a species of marine cnidarian in the order Corallimorpharia, a sea anemone-like corallimorph found on reefs in tropical regions of the Pacific Ocean. It is commonly known as the green fuzzy or elephant ear mushroom coral and also as the giant anemone, the giant mushroom anemone, the giant cup mushroom or the giant anemone. This species is toxic when eaten raw and ingestion can cause fatal poisoning.