Abstract Detail



Pteridology

Riibe, Lindsey [1], Testo, Weston [2], Sundue , Michael A [3], Sessa, Emily [4].

Morphology and sequence data resolve the Diplazium praestans mystery.

Diplazium praestans (Copel.) C. V. Morton is known from a small number of collections from lowland floodplain forests in eastern Peru and western Brazil. First described by Copeland in 1948 as an Athyrium, this species is unusual amongst Neotropical Athyriaceae in having simple leaves, single-sided sori, and reticulate venation. Following Copeland’s description, this species has gone mostly unnoticed by subsequent generations of pteridologists, and its taxonomic affinities remain unclear. After studying herbarium specimens of D. praestans, we concluded that it is probably not closely related to either Athyrium nor Diplaziumand is morphologically similar to members of the families Aspleniaceae, Hemidictyaceae, and Desmophlebiaceae. Analysis of cpDNA sequence data corroborates this hypothesis and resolves D. praestans in the Aspleniaceae. In light of these findings, we evaluate the morphology and taxonomy of this unusual species and discuss the relevance of our findings for circumscription of Aspleniaceae. 


1 - University of Florida, Biology Department, 521 Bartram Hall, Gainesville, FL, 32601, USA
2 - University of Florida, Department of Biology, 527 Bartram Hall, Gainesville, FL, 32601
3 - University of Vermont, Department of Plant Biology, 303 Jeffords Hall, Burlington, VT, 05405, United States
4 - University Of Florida, Biology, Box 118525, 521A Bartram Hall, Gainesville, FL, 32611, United States

Keywords:
systematics
morphology
Phylogenetics.

Presentation Type: Oral Paper
Number: 0005
Abstract ID:611
Candidate for Awards:None


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