The Capnella genus has an erect tree-like structure with lateral branches that are heavily forked. On the top of the branches there are clusters of non-retractable polyps. The base or stalk is without polyps and appears smooth. The stalk is shorter on the Capnella coral, which looks like a tree with a long trunk when erect. Though its stalk looks smooth, it has sclerites which makes the surface rough. Sclerites are tiny calcium bodies, similar to various sizes of tiny rice, that help support the coral. This gives the surface a rough feel rather than a slimy feel

  The colors of the Capnella corals are pretty basic. It has a stalk that is usually cream to brown, with some having a tint of green. The colors of the polyps are brown to greenish brown, and some color variations. Oddly, this coral has been known to mysteriously change colors. Blue lighting may bring out more green and blue colors.