Wagner, W.H.; Wagner, F.S. 1993: Ophioglossaceae. In: Pteridophytes and Gymnosperms. Vol. 2. In: Flora of North America Editorial Committee (ed.) Flora of North America. Oxford University Press, New York.
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| Wagner, W.H.; Wagner, F.S. 1993: Ophioglossaceae. In: Pteridophytes and Gymnosperms. Vol. 2. In: Flora of North America Editorial Committee (ed.) Flora of North America. Oxford University Press, New York. |