Corallum stands on a small base and swells upward into broad, stumpy lobes or branches, each produced into a number of swellings on top, their outermost portion usually curving inward. Living portion down to 1-6 cm from tips of branches.
Calicles slightly oval or angular, 3 mm average diameter; shallow, open. Walls of top calicles reticulate, very perforate, topped with twisted sharp spines; more solid looking in lower calicles, here topped with low, frosted granules.
Septa 24, distinct; those of upper calicles thin, edged with long slender often bent spines, loculi wide. Those of lower calicles thick, edges with lower blunt spines or granules, loculi as wide as septa. In all cases septa begin from calicinal rim, almost all reach columella.
Columella in upper calicles a loose reticulum, about one half of the calicinal diameter, with a number of bent, twisted tubercles or plates standing; that of lower calicles more compact, wider, over one half calicinal diameter, usually 6 low, frosted knobs, corresponding to pali, project upward from columellar surface.
