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Abstract Detail


Hooper, Elisabeth A [1], Yatskievych, George [2], Huiet, Layne [3], Pryer, Kathleen [4], Windham, Michael D. [5].

The current status of Aleuritopteris (Pteridaceae) based on recent molecular analyses. .

Recent molecular phylogenetic studies identified seven major lineages within cheilanthoid ferns (Pteridaceae, subfamily Cheilanthoideae). The largest of these is the hemionitid clade which includes more than 60% of the approximately 500 cheilanthoid species. Although several well-supported clades have been identified within the hemionitids, relationships among them remain poorly resolved. One particularly problematic lineage is Aleuritopteris Fée and its relatives. Unlike most hemionitids, which are New World in distribution, the ca. 40 species in Aleuritopteris are most diverse in Indo-Himalayan Asia. There are no known morphological synapomorphies that define Aleuritopteris; Fée emphasized the presence of farina, yet several members are not farinose. Many Aleuritopteris species have had a tumultuous taxonomic history, being placed in Allosorus, Cheilanthes, Cheilosoria, Leptolepidium, Mildella, Negripteris, or Sinopteris by different authors. To better understand relationships within Aleuritopteris and its phylogenetic position within the hemionitids, we conducted an analysis using three plastid gene markers (rbcL, atpA, and trnGR). Our preliminary results identify monophyletic species clusters, but with little resolution across the deeper nodes. Difficulties in circumscribing genera in this group appear to involve relatively recent and rapid diversification events that likely obscure older, deeper relationships. New molecular data, including nuclear markers, as well as renewed attention to cytology and morphology may provide new insights leading to a workable generic classification system for Aleuritopteris and other hemionitid ferns.

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1 - Truman State University, 100 E Normal Ave, Kirksville, Missouri, 63501-4200, United States
2 - University of Texas at Austin, Plant Reources Center, Austin, Texas, 78712-1711, USA
3 - Duke University, Herbarium, Durham, NC, 27707, USA
4 - Duke University, Science Drive, Durham, NC, 27708-0338, USA
5 - DUKE UNIVERSITY, Department Of Biology, BOX 90338, DURHAM, NC, 27708, USA

Cheilanthoid ferns
fern phylogeny.

Presentation Type: Oral Paper
Session: 6, Pteridological Section/AFS
Location: Sundance 1/Omni Hotel
Date: Monday, June 26th, 2017
Time: 9:30 AM
Number: 6001
Abstract ID:460
Candidate for Awards:Edgar T. Wherry award

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