Characters: Colonies consist of whorls of delicate, unifacial, undivided or bifurcating fronds. Valleys are shallow and parallel to frond margins. There is almost no development of columellae.

Colour: Pale brown or purple.

Similar Species: Pachyseris involuta. Pachyseris speciosa in turbid water has similar skeletal detail.

Habitat: Lagoons and protected reef slopes.

Abundance: Uncommon.