Corallum massive, light, 5 cm high, shaped like a broad, low inverted cone – apex being large base of attachment of corallum, while base is the expanded, almost plane, calicinal surface.
Upper surface (calicinal) circular, 14 cm across. Lower surface outside of big scar of attachment partly covered with thin epitheca, marked all over with large blisters. Costae corresponding to large septa prominent only just outside calicinal surface, obsolete below.
Valleys up to 1 cm deep, narrow – distance across from summits of bordering collines may reach around 1.5 cm but actual depression may be 3-4 mm across, collines being greatly bloated, sides of valleys vertical so valleys look constricted. Valleys sinuous, branching, some independent ones present.
Collines greatly swollen by endothecal vesicles, width 5-10 mm; summits almost plane, exposed or bare because of total absence of ridge.
Septa upright, 5 per cm, exsert 3-5 mm above colline summit; exsert portion with rounded apices; inner edge drops vertically down to bottom of valleys; outer portion slightly oblique, free (ridge being absent), the 2 rows of septa on colline leave a gap between them. Few narrower, lower septa intercalated among tall ones.
Calicinal centers not very distinct except those at heads of valleys.
The paratype, UPC-408-CC (Fig. 23), has less sinuous valleys, more exsert septa (7-8 mm above collines), the two rows of septa on a colline are closer together so the gap between is very narrow.
The species is distinguished by the very exsert, erect septa almost without connecting ridges along summit of the collines.
