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AJB Advance Access
Published online ahead of print October 31, 2008;
doi:10.3732/ajb.0800122
American Journal of Botany
© 2008 Botanical Society of America, Inc.
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Research Article

The sporophyte-less filmy fern of eastern North America Trichomanes intricatum (Hymenophyllaceae) has the chloroplast genome of an Asian species1

Atsushi Ebihara2,5, Donald R. Farrar3 and Motomi Ito4

2 Department of Botany, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba 305-0005, Japan 3 Department of Ecology, Evolution, and Organismal Biology, Iowa State University, 353 Bessey Hall, Ames, Iowa 50011-1020 USA 4 Department of System Sciences, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan

ABSTRACT

Trichomanes intricatum, the sporophyte-less filmy fern of the eastern United States, has been considered to be a species whose sporophyte generation has become extinct or is possibly still present among the many species of Trichomanes s.l. in the new world tropics but unable to grow in a temperate climate. A close relationship to Asian species has heretofore not been considered. Comparison of rbcL and rps4-trnS sequences to species of Trichomanes s.l. reveals that T. intricatum shares its chloroplast genome with Crepidomanes schmidtianum of eastern Asia. Because C. schmidtianum is a sterile triploid and the ploidy level of T. intricatum is unknown, several scenarios leading to their sharing of these maternally inherited genes must be explored.

Key Words: biogeography • fern • gametophyte • Hymenophyllaceae • pteridophyte • rbcL • rps4-trnS • Trichomanes intricatum

Received for publication April 2, 2008. Accepted for publication September 2, 2008.

FOOTNOTES

1 The authors thank S. Fujimoto, T. Iwata, S. Matsumoto, and T. Wangdi for collecting plant material and M. Kato for giving valuable comments on the study.

5 Author for correspondence (e-mail: ebihara{at}kahaku.go.jp)


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