Alsophila firma (Baker) D.S. Conant, J. Arnold Arbor. 64: 372. 1983 sec. Mickel & Smith 2004
- =Cyathea mexicana Schltdl. & Cham., Linnaea 5: 616. 1830 syn. sec. Mickel & Smith 2004
- =Cyathea articulata Fée, Mém. Foug., 8. Ic. Esp. Nouv.: 111. 1857 syn. sec. Mickel & Smith 2004
- =Cyathea trejoi Christ, Bull. Herb. Boissier ser. 2, 5: 733. 1905 syn. sec. Mickel & Smith 2004
- =Cyathea firma Domin, Pteridophyta 264. 1929 syn. sec. Mickel & Smith 2004