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Total: 2
genus
valid
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Spermopteris
Cridland, Morris
Amer. J. Bot., 47(10):
855.
23 Dec 1960
genus
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Ptilophyllum
Morris
Trans. Geol. Soc. (London), Ser. 2, 5(2):
Explan. Pl. XXI [1].
1 Jan 1840