Synonym
Macrozamia tridentata f. diplomera (F.Muell.) J.Schust.
Published in: in Engler, Pflanzenr. 99: 94. 1932. 
(Pflanzenr. (Engler) 
)
This name is considered a Synonym of Macrozamia diplomera (F.Muell.) L.A.S.Johnson