Corallum large, explanate, foliate; its base arising from dead portion of same colony; the folia, arising at intervals, arranged in tiers. Folium bifacial, semicircular in shape, horizontal in position; some deeply curled, others concave; edge very thin, sharp, slightly sinuate. Average folium 7 x 10 cm across.
Upper surface covered all over with circular or subcircular corallites of different dimensions, the smallest mostly along free border. Corallites mostly level with surface, protruding ones only slightly elevated; cylindrical; average diameter at base 5 mm, calice 3 mm. Some corallites appear to be either merging or dividing by intercalicinal fission, so that short linear rows of 2-4 or more found among those that do not show any discernible pattern of arrangement. Corallites unequally distant – from very close to 8 mm apart, measured from calicinal centers.
Septa in 3 cycles. Primaries (6) and secondaries (6) indistinguishable, both reaching columella, thinner than loculi; surface spinulate; edge cut into 2 or 3 tall spinulous vertical spines; inner portion drop vertically into deep fossa. Tertiaries appearing as low as ridges, far short of columella, some joining secondaries medially. Paliform lobes not very obvious.
Costae in form of very distinct rows of tall spinulous spines; rows continuous into intercalicinal areas without ridges connecting corallites; along outer edge of folium spines absent and very fine ridges appear.
Columella almost absent, appearing in some calices as very lax network of fibers.
The striking and very distinctive character of this species is the presence of very prominent – large, very protruding – corallites on under surface of folium. Like those on upper surface, corallites here unequally distant, unequal in size; some corallites cylindrical, others turbinate; some circular on top, others oval. Average height 5 mm; dividing corallite with 2 calicinal centers 4 x 7 mm across; another with 3 calicinal centers 8 x 11 mm. Smallest corallites some distances inward from free edge. Strip, around 10 mm wide devoid of corallites crossed by fine ridges, follows free margin of folium. Many corallites exhibit definite fission, producing 2, 3 or 4 centers. Septal picture similar to that of upper surface exceot that septal spines lower. Perithecl spines finer, lower, less spinulous, not as distinctly seriate as those on upper surface.
