Notes: Massive, with oscular mounds or volcanoes, dark green to brown black or gray. It becomes dark and exudes abundant mucus when handled. Distinguished from S. aurea (Hyatt, 1875), also pictured here, by having blunt ends of primary fibers protruding on the surface, while the surface of S. aurea forms a honeycomb pattern of ridges. These primary fibers are also wider apart than in S. aurea. S. aurea fibers are also wider, especially the secondary reticulum, with many characteristic rectangular meshes (longer axis perpendicular to de surface).
Author Reference: Pulitzer-Finali, 1986
Link: World Porifera Database