Occurrence of the European Polypodium australe Fee on San Clemente Island, California

Abstract

These include Polypodium virginianum L., with diploid and tetraploid races, occurring from the eastern seaboard to British Columbia; P. hesperium Maxon, a species also with diploid and tetraploid races, found from British Columbia south to Arizona; P. glycyrrhiza D. C. Eaton, a diploid species, distributed from central California north to Alaska; P. scouleri Hook. & Grev., a diploid coastal species which is the most distinct of the complex, occurring only on Guadalupe Island, Santa Cruz Island, Morro Rock in the southern portion of its range and on the mainland 56