Abstract Detail

Floristics & Taxonomy

Jaksich, Sarah [1], Oppenheimer, Hank [2], From, Margaret [3], Kellar, Pamela [4].

Phylogenetics of Hawaiian Diplazium (Athyriaceae: Polypodiales).

Hawaii is home to four species in the fern genus Diplazium: Diplazium arnottii, D. esculentum, D. molokaiense, and D. sandwichianum. Three are endemic to the Hawaiian Islands, and one is introduced and naturalized (D. esculentum). They vary in frequency, from very abundant (D. sandwichianum) to rare and critically endangered (D. molokaiense). Prior to this work, the phylogenetic relationships of only D. esculentum had been estimated due to lack of information available about these species. In this study, we inferred phylogenetic relationships of the Hawaiian Diplazium based on six chloroplast regions – atpA, atpB, matK, rbcL, rps4+rps4trnS IGS, and trnL intron+trnL­–trnF IGS. We downloaded these plastid markers from GenBank for an additional 84 Diplazium species and two Athyrium species, and used the latter as outgroups. The resulting phylogeny inferred from combined data indicated that D. arnottii and D. sandwichianum are sister taxa, likely with origins in the Paleotropics. Morphologically, the two species can be distinguished by leaf dissection and lengths of sori. Diplazium molokaiense is sister to the Asian D. heterocarpum (among our sampled taxa). Diplazium molokaiense is distinguished from other species in the clade by its large sori and longer fronds. Our results reveal the phylogenetic placements of three Diplazium species and corroborate the placement of a fourth species. This knowledge clarifies species’ statuses, which will aid in conservation of these threatened or endangered species.

1 - University of Nebraska at Omaha, Biology, 6001 Dodge Street, Omaha, NE, 68182, USA
2 - University of Hawaii at Manoa, Plant Extinction Prevention Program, 2500 Campus Road, Honolulu, HI, 96822, USA
3 - 3701 South 10th Street, Omaha, NE, 68107, United States
4 - University Of Nebraska At Omaha, Biology, 6001 Dodge St. - AH 521C, Omaha, NE, 68182, United States

eupolypods II
Molecular phylogeny

Presentation Type: Poster
Session: P, Floristics & Taxonomy Posters
Location: Virtual/Virtual
Date: Wednesday, July 29th, 2020
Time: 5:00 PM Time and date to be determined
Number: PFT001
Abstract ID:121
Candidate for Awards:None

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