Regularity: Regularly occurring
Regularity: Regularly occurring
Localities documented in Tropicos sources
Canada (North America)
United States (North America)
Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
- Mickel, J. T. & A. R. Smith. 2004. The Pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1–1054. http://www.tropicos.org/Reference/1025841
- Mickel, J. T. & J. M. Beitel. 1988. Pteridophyte Flora of Oaxaca, Mexico. Mem. New York Bot. Gard. 46: 1–568. http://www.tropicos.org/Reference/9402
- Breedlove, D. E. 1986. Flora de Chiapas. Listados Floríst. México 4: i–v, 1–246. http://www.tropicos.org/Reference/513
- Davidse, G., M. Sousa Sánchez & S. Knapp. (eds.) 1995. Psilotaceae a Salviniaceae. Fl. Mesoamer. 1: i–xxi, 1–470. http://www.tropicos.org/Reference/47044
- García-Mendoza, A. J. & J. Meave del Castillo. 2011. Divers. Florist. Oaxaca 1–351. Universidad Nacional Autónoma de México, Ciudad Universitaria. http://www.tropicos.org/Reference/100009052
Global Range: Canada south to the Gulf states, Mexico and Central America (Spackman et al. 1997).
Molecular Biology and Genetics
Barcode data: Pellaea atropurpurea
Statistics of barcoding coverage: Pellaea atropurpurea
Public Records: 1
Specimens with Barcodes: 5
Species With Barcodes: 1
National NatureServe Conservation Status
Rounded National Status Rank: N3 - Vulnerable
Rounded National Status Rank: N5 - Secure
NatureServe Conservation Status
Rounded Global Status Rank: G5 - Secure
Comments: Limestone quarrying presents a low-level threat to this species (Southern Appalachian Species Viability Project 2002).
This is a fern, P. atropurpurea, commonly known as purple-stem cliffbrake or just purple cliffbrake. Brake is an old word for fern, related to the word bracken. Like many other members of the Pteridaceae, it is a rock plant, needing a calcareous substrate.
P. atropurpurea is an apogamous autotriploid, with 3n=87 (actual base number, n=29), and is one of the historical parents of the hybrid species complex, Pellaea glabella. Apogamy, or the ability to reproduce non-sexually, is common among rock ferns in the Pteridaceae.
This fern produces clumps of widely arching fronds. The stipe and rachis of the blade are purple, while the blade itself has a blue-gray tinge to it. The upper pinnae are long, narrow, and undivided, while the lower ones are divided into 3-15 pinnules. The pinnae are, for the most part, opposite. Fertile fronds are longer and more heavily divided. They produce sori, which lack a true indusium, within the inrolled margins of the pinnae.
This plant may be distinguished from the similar Pellaea glabella by its hairier nature and larger form.
Pellaea atropurpurea grows in the crevices of dry limestone cliffs, rocky slopes, crevices in alvars, and mortared walls. It is endangered in Florida, Iowa, and Rhode Island. It has become extinct in Louisiana since the limestone caprock of a salt dome at Winfield, the only location for the fern in the state, was quarried away.
- Catling, P.M. and Brownell, V.R. 1999. Alvars of the Great Lakes Region. p. 375-391, in R. C. Anderson, J. S. Fralish, and J. M. Baskin (eds.) Savannas, Barrens and Rock Outcrop Communities of North America. Cambridge: Cambridge University Press. Table 23.3
- Moore 2013.
- Boughton C. 2005. Ferns of Northeastern and Central North America. New York: Houghton Mifflin. 417p.
- Moore, David (Spring 2013). "The limestone hill at Winnfield Louisiana". Louisiana Native Plant Society Newsletter 27 (2): 5–7.
- USDA Plants Database: P. atropurpurea
- P. atropurpurea in Flora of North America
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