Production of connecting cells and the diploidization of the supporting cell prior to cutting off of the auxiliary cell are newly reported for Griffithsia okiensis Kajimura together with some other morphological notes. Morphological comparison of G. okiensis and its allied two taxa which have two carpogonial branches borne on the single supporting cell, namely, G. monilis Harvey var. cincta Baldock and G. teges Harvey is also made in this poper.