References
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
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