Habitat: Shallow reefs and seagrass beds Distribution: Caribbean, North Carolina, Bermuda, Indian Ocean, West central Pacific. Characteristics: Massive to repent branches (1-3 cm in diameter). Volcano-shaped Oscules (2-5 mm). Light green externally and internally. Soft and compressible in consistency. Spicules in A.viridis are 153 x 6,8 microns.