Polypary four or five inches in length, straight or very slightly curved, attaining a maximum diameter of one-twelfth of an inch. Hydrothecæ short and broad cups, with subquadrangular section, 20 to 24 to the inch, without overlap, inclined at an angle of about 45°; outer edge convex distally, proximally impressed; apertural margin deep, concave, at right angles to the general direction of the theca; denticle triangular and inornate.