this is an information of the Solenocaulon:
Colony shape: Colonies generally of moderate size (ca 15 cm; however a few very large colonies, with fans of 1.5 m diameter, have also been recorded), and irregularly branching in one plane. Although the stemk and somoe major branches may be solid, most or all of the branches arehollow, tubular or gutter-like, and may have numerous large holes in their sides.
The ends of tubular branches tend of have portions of the sidewalls flattening out in an irregular leaf-like manner.
Colonies may attach to substrate including loose coral and shell fraqgments, but commonly have a flat, spatulate basal e¿xtension that anchors them in soft substrate.
Colonies are easily broken, as the axial substance that forms the centre of the stalk and the inner layer of the walls of the tubes, is formed only from closely packed sclerites.
Polyps: Monomorphic and retractile into low dome-like calyces. Their distribution varies amongst the species. They are commonly arrenged irregularly along the rims of the holes and gutters, they may also occur densely or sparsely on branch surfaces, and they may be or less confined of the smaller terminal branches.
information of the book: Soft Corals and Sea Fans for Fabricius and Alderslade