Thursday, August 24, 2017

Digitate ↔ Columnar

Digitate refers to colonies showing finger-like projections like an upturned hand (e.g. the bottom of pg. 1 in the Coral Finder).  Where these fingers become thicker and taller they may be referred to as sub-massive or columnar (e.g. p. 28 of the Coral Finder).  Note sub-massive may be used to describe lumpy massive colonies described above, or knobbly columns.

Corals with finger-like branches are termed digitate. Corals with thicker "fingers" form columnar growth forms - the genus Acropora (left) and Isopora (right).