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Total: 3
genus
valid
Genus
Arthraria
Billings
Canad. Naturalist & Quart. J. Sci., 6(4):
467.
Sep 1872
genus
valid
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Beatricea
Billings
Rep. Progr. Geol. Survey Canada, 1853-1856
343.
1857
genus
valid
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Pasceolus
Billings
Rep. Progr. Geol. Survey Canada, 1853-1856
342.
1857