References
For Phegopteris
Fawcett, S., and A.R. Smith. 2021. A generic classification of the Thelypteridaceae. Bot. Res. Inst. Texas Press, Ft. Worth, TX. Google Scholar
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Gilman, A.V. 2020. Tall beech fern, a new beech fern in New England, New York, and Canada. Published by the author, Marshfield, VT. Google Scholar
Lin, Y., Z. Li, K. Iwatsuki, and A.R. Smith. 2013. Thelypteridaceae. In Flora of China. Google Scholar
Patel, N.R., S. Fawcett, and A.V. Gilman. 2019. Phegopteris excelsior (Thelypteridaceae): a new species of North American tetraploid beech fern. Novon 27: 211-218. Google Scholar
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Smith, G.L., and W.S. Flory. 1990. Studies on Hymenocallis henryae (Amaryllidaceae). Brittonia 42: 212-220. Google Scholar