Note 17 — DIVISION II. MUSCINEÆ (MOSSES).
Michael Cresse Potter translation
The oospore divides by a wall transverse or oblique to the longer axis of the archegonium. From the upper (epibasal) cell, the capsule (and seta) is derived, while the lower (hypobasal) gives rise to the foot. In Riccia the hypobasal half takes part in the formation of the sporangium.