Abstract Detail

Ferns at the extreme: the case of moonworts, grape-ferns and adder’s tongues of the family Ophioglossaceae

Stensvold, Mary [1], Farrar, Donald [2].

A third species in the Botrychium “lanceolatum” clade resolves unique parentages of ten allopolyploid taxa displaying bipinnate morphology.

Genetic analyses of plants in the “lanceolatum” clade of diploid Botrychium taxa supports recognizing a third diploid species in the clade. Botrychium rubellum ined., currently known to occur in western North America from the southern Rocky Mountains to Alaska and Yukon, and disjunctly in Greenland. It differs in distribution and morphology from B. lanceolatum (S. G. Gmelin) Angström and B. angustisegmentum (Pease & A. H. Moore) Fernald. These three taxa are nearly equidistant from one another in genetic distance and private alleles. Morphologically, B. rubellum ined. is differentiated by having upswept basal pinnae with basiscopic pinnules much longer than acroscopic pinnules, and dark red coloration of the common stalk below the trophophore. The twice pinnate diploid taxa of the lanceolatum clade are hypothesized to have hybridized with once pinnate diploid taxa of the “lunaria” and “campestre” clades to produce ten bipinnate taxa of fertile allopolyploids. Based on the presumption of only two diploid taxa of the lanceolatum clade, several of these allopolyploids have been interpreted as having identical diploid parentages, although distinct morphologically. Recognition of a third diploid taxon of the lanceolatum clade allows assigning unique diploid parentage to each of the currently recognized allopolyploids.

1 - Sitka Sound Science Center, 834 Lincoln Street, Sitka, AK, 99835, USA
2 - Iowa State University, Department Of Ecology, Evolution And Organismal Biology, 251 Bessey Hall, Ames, IA, 50011.0, United States

Keywords:
Botrychium
diploid
lanceolatum
rubellum.

Presentation Type: Colloquium Presentations
Number: C4006
Abstract ID:274
Candidate for Awards:None