Stiff CloakfernCarl Rothfels
Notholaena rigida is a Mexican endemic with an oddly disjunct distribution. Plants of extreme northeastern Mexico (Tamaulipas and Nuevo Leon) are slightly larger than those of Chiapas, in extreme southern Mexico; the species is not known to occur elsewhere. Plants of the two areas differ in other ways (northern individuals have slightly asymmetrical pinnae and white farina, whereas southern individuals have symmetrical pinnae and lack farina; Mickel and Smith, 2004). Further study is needed.
This species is anomalous as a member of core Notholaena I in that it lacks hairs and scales on the leaves. Nonetheless, plastid DNA data (from one of the northern individuals) place it firmly nested in that clade, close to N. aschenborniana, of all species (N. aschenborniana is densely hairy and scaly; Rothfels et al., 2008). It does resemble the other members of that clade, however, in its linear leaf blades.
The absence of hairs and scales on the leaves distinguish this species from most other linear-leaved farinose taxa. It differs from N. lemmonii by its leaf stalk (smooth rather than grooved) and from N. meridionalis by range (in Oaxaca, where the two species could potentially overlap, N. rigida is nonfarinose) and by the presence, on N. meridionalis, of tiny hairs on the leaf upper surfaces.
- Cheilanthes rigida
- Chrysochosma rigida
- Vernacular Names: Stiff Cloakfern
Giauque, M. F. A. 1949. Wax glands and prothallia. American Fern Journal 39:33-35.
Mickel, J. T., and A. R. Smith. 2004. The Pteridophytes of Mexico. The New York Botanical Garden Press, New York.
NatureServe. 2008. NatureServe Explorer, Arlington, Virginia. www.natureserve.org/explorer/
Rothfels, C. J., M. D. Windham, A. L. Grusz, G. J. Gastony, and K. M. Pryer. 2008. Toward a monophyletic Notholaena (Pteridaceae): Resolving patterns of evolutionary convergence in xeric-adapted ferns Taxon 57:712-724.
Tryon, R. M. 1956. A revision of the American species of Notholaena. Contributions from the Gray Herbarium 179:1-106.
Windham, M. D. 1993a. Notholaena. Pages 143--149 in Flora of North America (Flora of North American Editorial Committee, ed.) Oxford University Press, New York.
Windham, M. D., and G. Yatskievych. 2003. Chromosome studies of cheilanthoid ferns (Pteridaceae: Cheilanthoideae) from the western United States and Mexico. American Journal of Botany 90:1788-1800.
Wollenweber, E. 1984. Exudate flavonoids of Mexican ferns as chemotaxonomic markers. Rev. Latinoamer. Quim. 15:3-11.
Duke University, Durham, North Carolina, USA
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Page copyright © 2008 Carl Rothfels
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- First online 23 December 2008
- Content changed 23 December 2008
Citing this page:
Rothfels, Carl. 2008. Notholaena rigida http://tolweb.org/Notholaena_rigida/133596/2008.12.23 in The Tree of Life Web Project, http://tolweb.org/. Stiff Cloakfern. Version 23 December 2008 (under construction).