Colony branched. Branches arising from explanate, creeping base; coalescent, crooked, biggest about 25 cm high; branchlets slender, tapering, but bigger ones tend to become palmate.
Corallites irregularly arranged on branches, unevenly distant, mammiform, bases much swollen. Average diameter at base 8 mm, 3-4 mm across calicinal mouth; 4-5 mm above perithecal surface. Young corallites with almost same diameter at base and mouth.
Septa in 3 cycles, those of the third incomplete, always narrow or rudimentary; 14-18 reaching columella; exsert, thin inside wall, suddenly thickened into costae; surface finely granulous, edge vertical, lower portion with 1 to 3 long, slender projections usually directed obliquely clockwise around columella, upper portion almost entire or finely granulous.
Costae thick, uniform height throughout extent, crossing perithecal area to neighboring corallites; showing alternation of large and small ones; edges granuluos. Small costae often without corresponding septa or at most only incipient ones.
Columella with a number of slender tubercles, twisted, lax.
