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Pteridological Section/AFS

Willis, Tracy [1], Nester-Hudson, Joan [1].

Characterization of a Thelypteris hybrid from Walker County, Texas.

A new Thelypteris species with unknown origin was discovered in Walker County, Texas. Taxonomic features resemble both Thelypteris kunthii (tetraploid) and Thelypteris ovata var. lindheimeri (diploid), indicating hybridity. The three ferns were studied to determine if this new fern could be a hybrid with T. kunthii and T. ovata var. lindheimeri as the parents. Spores of the putative hybrid examined by light and SEM appear to be abortive and sterile with 0% germination. Spore and guard cell measurements were intermediate to the presumed diploid and tetraploid parental species indicating that the hybrid is triploid. Morphological characters examined in the putative hybrid were an array of parental, intermediate and extreme characters, suggesting that it may have resulted from a cross between T. kunthii and T. ovata var. lindheimeri.


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1 - Sam Houston State University, Department of Biological Sciences, Box 2116, Huntsville, Texas, 77341-2116, USA

Keywords:
Thelypteris
fern
Hybrid.

Presentation Type: Oral Paper
Session: 5-7
Location: 602/Hilton
Date: Monday, August 15th, 2005
Time: 10:45 AM
Abstract ID:371


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