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Rediscovery of Polypodium calirhiza (Polypodiaceae) in Mexico

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Date
2014-01-01
Authors
Sigel, EM
Windham, MD
Smith, AR
Dyer, RJ
Pryer, KM
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Abstract
This study addresses reported discrepancies regarding the occurrence of Polypodium calirhiza in Mexico. The original paper describing this taxon cited collections from Mexico, but the species was omitted from the recent Pteridophytes of Mexico. Originally treated as a tetraploid cytotype of P. californicum, P. calirhiza now is hypothesized to have arisen through hybridization between P. glycyrrhiza and P. californicum. The tetraploid can be difficult to distinguish from either of its putative parents, but especially so from P. californicum. Our analyses show that a combination of spore length and abaxial rachis scale morphology consistently distinguishes P. calirhiza from P. californicum, and we confirm that both species occur in Mexico. Although occasionally found growing together in the United States, the two species are strongly allopatric in Mexico: P. californicum is restricted to coastal regions of the Baja California peninsula and neighboring Pacific islands, whereas P. calirhiza grows at high elevations in central and southern Mexico. The occurrence of P. calirhiza in Oaxaca, Mexico, marks the southernmost extent of the P. vulgare complex in the Western Hemisphere. © 2014 The New York Botanical Garden.
Type
Journal article
Permalink
https://hdl.handle.net/10161/21762
Published Version (Please cite this version)
10.1007/s12228-014-9332-6
Publication Info
Sigel, EM; Windham, MD; Smith, AR; Dyer, RJ; & Pryer, KM (2014). Rediscovery of Polypodium calirhiza (Polypodiaceae) in Mexico. Brittonia, 66(3). pp. 278-286. 10.1007/s12228-014-9332-6. Retrieved from https://hdl.handle.net/10161/21762.
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Pryer

Kathleen M. Pryer

Professor of Biology
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