Campanularia Lamarck, 1816

Diagnosis. (Bouillon et al. 2006). Colony stolonal, seldom erect and branched, hydrorhiza not anastomosing, hydrothecal pedicel unbranched, hydrotheca campanulate or bell-shaped with entire or cusped margin, demarcated from pedicel basally by a variously developed annular perisarcal thickening, hydrothecal walls with unthickened perisarc, not abruptly everted distally, true diaphragm absent, subhydrothecal spherule present, gonophores fixed sporosacs, gonotheca on hydrorhiza.