Habitat: Common on mangrove roots and other sponges. Distribution: Caribbean, Florida. Characteristics: Thinly encrusting to small mounds (< 1-3 mm thick) with volcano-like oscular elevations (1-2 mm high, 0.4-1.2 cm wide). Oscules small (1-3 mm). Commonly stolons branch off main body. Bright to drab turquoise green. Surface smooth and punctuate. Soft.