Entry for Notholaena copelandii C. C. Hall [family ADIANTACEAE]
Entry From
Flora of North America, Vol 2,
Names
Notholaena copelandii C. C. Hall [family ADIANTACEAE], Amer. Fern J., 40: 181, plate 16. 1950
Cheilanthes candida M. Martens & Galeotti var. copelandii (C. C. Hall) Mickel [family ADIANTACEAE]
Chrysochosma candida (M. Martens & Galeotti) Kümmerle var. copelandii (C. C. Hall) Pichi-Sermolli [family ADIANTACEAE]
Notholaena candida (M. Martens & Galeotti) Hooker var. copelandii (C. C. Hall) R. M. Tryon [family ADIANTACEAE]
Discussion
Notholaena copelandii often has been treated as a variety of the Mexican species N . candida (M. Martens & Galeotti) Hooker. The two taxa show significant differences in stem scale and leaf morphology (R. M. Tryon 1956), density of glands on the adaxial leaf surface, and chemical composition of the farinose indument (E. Wollenweber 1984). Measures of genetic similarity based on isozyme data indicate that N . copelandii and N . candida are quite distinct and, at present, allopatry precludes gene flow. Past hybridization may account for the small number of intermediate specimens reported from San Luis Potosí, Mexico, by R. M. Tryon (1956).