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Total: 6

genus valid

Genus Azollopsis J.W. Hall Amer. Fern J., 58(2): 81. 24 Jun 1968

genus valid

Genus Callandrium Stidd, J.W. Hall Amer. J. Bot., 57(4): 398. 30 Apr 1970

genus valid

Genus Costatheca J.W. Hall J. Paleontol., 41(5): 1298. 22 Sep 1967

genus valid

Genus Parazolla J.W. Hall Amer. J. Bot., 56(10): 1174. 17 Dec 1969

genus valid

Genus Premnoxylon R.L. Pierce, J.W. Hall Phytomorphology, 3(4): 384, 389. Dec 1953

genus valid

Genus Styx N.J. Norton, J.W. Hall Rev. Palaeobot. Palynol., 2(1-4): 104. 23 Oct 1967

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