• Calamisporites P. Danzé-Corsin & J.P. Laveine, 1963 † accepted as Calamospora J.M. Schopf, L.R. Wilson & R. Bentall, 1944 †
• Callisporites M.A. Butterworth & R.W. Williams, 1958 † (uncertain)
• Canisporites E. Nakoman, 1975 † (uncertain)
• Cladosporites J. Félix, 1894 †
• Clavatisporites M. Kedves & P. Simoncsics, 1964 †
• Clavisporis D.C. Bharadwaj & B.S. Venkatachala, 1962 † (uncertain)
• Colatisporites J.E. Williams in R. Neves et al., 1973 † (uncertain)