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Total: 6
genus
valid
Genus
Styx
N.J. Norton, J.W. Hall
Rev. Palaeobot. Palynol., 2(1-4):
104.
23 Oct 1967
genus
valid
Genus
Premnoxylon
R.L. Pierce, J.W. Hall
Phytomorphology, 3(4):
384, 389.
Dec 1953
genus
valid
Genus
Parazolla
J.W. Hall
Amer. J. Bot., 56(10):
1174.
17 Dec 1969
genus
valid
Genus
Costatheca
J.W. Hall
J. Paleontol., 41(5):
1298.
22 Sep 1967
genus
valid
Genus
Callandrium
Stidd, J.W. Hall
Amer. J. Bot., 57(4):
398.
30 Apr 1970
genus
valid
Genus
Azollopsis
J.W. Hall
Amer. Fern J., 58(2):
81.
24 Jun 1968