Polypodium speluncae L.: A Question of Nomenclature
Christensen, Carl, 1872-1942
Article
1913
American fern journal
3
1--4
BioStor
English
[Washington, etc.] American Fern Society
BioStor: https://biostor.org/reference/218055 DOI: https://doi.org/10.2307/1544037