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

Fujiwara, T., J. Ogiso, S. Ishii, N. Nakato, S. Serizawa, Y.-S. Chao, H.-T. Im, A. Ebihara, and Y. Watano. 2021. Species delimitation in the Phegopteris decursivepinnata polyploid species complex (Thelypteridaceae). Acta Phytotax. Geobot. 72: 205-226. Google Scholar

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

Smith, A.R. 1993a. Thelypteridaceae. In Flora of North America Editorial Committee. 1993b. Flora of North America north of Mexico. Volume 2, pteridophytes and gymnosperms. Oxford Univ. Press, New York, NY. 475 pp. Google Scholar

Smith, G.L., and W.S. Flory. 1990. Studies on Hymenocallis henryae (Amaryllidaceae). Brittonia 42: 212-220. Google Scholar