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Often treated as N. candida var. copelandii, Notholaena copelandii differs from N. candida in morphology (Hall, 1950), farina chemistry (Wollenweber, 1984; Wollenweber et. al 2001), geographic range, and plastid DNA sequences (Rothfels et al., 2008). I thus follow Windham (1993a) and Mickel and Smith (2004) in treating them as distinct species.
Notholaena copelandii is a species of southern Texas and northeastern Mexico, where it occurs on limestone cliffs and outcrops.