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Abstract Detail



Pteridological Section/AFS

Lee, Nicole [1], Hauk, Warren [2].

Phylogenetic relationships among species of adders tongue ferns (Ophioglossum s.s., Ophioglossaceae).

Ophioglossum s.s. is best known for small size and high chromosome numbers, with O. reticulatum holding the world record of 2n = 1260. Although the approximately 25-30 Ophioglossum s.s. species are distributed widely throughout temperate and tropical regions of the world, the group has largely been overlooked in terms of modern systematic investigation. The dearth of morphological characters coupled with astounding intraspecific chromosome number variation may have contributed to their taxonomic neglect. With trepidation we investigated phylogenetic relationships among 30 accessions of 17 Ophioglossum s.s. species using five cpDNA regions (rbcL, trnL-F intergenic spacer, rpl16 intron, chlL, and chlN). Preliminary analyses revealed strong support for the monophyly of Ophioglossum s.s. and three main clades. All five species for which we sampled multiple accessions (O. crotalophoroides, O. nudicaule, O. vulgatum, O. gramineum, and O. petiolatum) were recovered as polyphyletic or paraphyletic. Our data suggest that either morphological characters are unreliable for identifying Ophioglossum s.s. species or that complex patterns of speciation have occurred, or both.

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1 - Denison University, Department of Biology, 350 Ridge Rd., Granville, OH, 43023, USA
2 - DENISON UNIVERSITY, Department of Biology, 350 Ridge Road, GRANVILLE, OH, 43023, USA

Keywords:
Ophioglossum
adders tongue fern
phylogeny.

Presentation Type: Oral Paper:Papers for Sections
Session: 34
Location: Melrose/Riverside Hilton
Date: Tuesday, July 30th, 2013
Time: 4:15 PM
Number: 34011
Abstract ID:795
Candidate for Awards:None


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