Usually the metal is arborescent, dendritic, filiform, moss-like or laminar.
The main streams are tortuous, and their dendritic tributaries have cut the region into ridges.
Dendritic: applied to the branched nerve cells in the mushroom bodies of the pro-cerebrum.
At other times it is found in dendritic shapes, or arborescences, resulting from minute crystals implanted upon each other.
The zoœcia are not distinct from one another, but in dendritic forms the zoarium is divided irregularly by chitinous partitions.