Brittonia

, Volume 57, Issue 2, pp 183–201 | Cite as

Origin and taxonomic affinities of Thelypteris (subgen. Stegnogramma) burksiorum (Thelypteridaceae)

  • James E. Watkins
  • Donald R. Farrar
Biogeography

Abstract

This paper examines the ecology, frond and spore morphology, gametophytes, and molecular biology ofThelypteris burksiorum to reveal its taxonomic affinities and phytogeographic origin. The species is endemic to Winston County in northern Alabama (U.S.A.) and only occurs in cave-like rockhouse habitats. A related species,T. pilosa, is widespread in central and southern Mexico, Guatemala, and Honduras.Thelypteris pilosa is extremely variable and our data suggest that current recognition of the varietiesmajor andpilosa is not warranted.Thelypteris pilosa is clearly closely related and likely sister toT. burksiorum. Thelypteris burksiorum exhibits the unusual production of gametophytic propagules. This, in combination with current levels of genetic diversity and reproductive biology, suggests thatT. burksiorum is an ancient Tertiary relict and not an example of recent long distance dispersal. Selection in rockhouse habitats has driven species away from their normal life cycle to partial or complete reliance on the gametophyte generation. The combination of a reduced yet fertile sporophyte and a gametophyte that may rely on gametophytic proliferation placesT. burksiorum in an intermediate evolutionary position relative to other rockhouse pteridophytes.

Key words

Thelypteris burksiorum Stegnogramma disjunct distribution fern pteridophyte rockhouse Thelypteridaceae 

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Literature Cited

  1. Aubreville, A. 1964. Flore du Cameroun: Pteridophyta. Museum National D'Histoire Naturelle. Paris.Google Scholar
  2. Bold, H. C. 1957. Morphology of plants. Harper & Row, New York.Google Scholar
  3. Burrows, J. E. 1990. Southern African fern & fern allies. Frandsen Publishers, Sandton.Google Scholar
  4. Chiou, W.L. &D. F. Farrar. 1997. Antheridiogen production and response in Polypodiaceae species. Amer. J. Bot. 84: 633–640.CrossRefGoogle Scholar
  5. Crawford, L. C. 1951. A new fern for the United States. Amer. Fern J. 41: 15–20.CrossRefGoogle Scholar
  6. Farrar, D. R. 1967. Gametophytes of four tropical fern genera reproducing independently of their sporophytes in the southern Appalachians. Science 155: 1266–1267.PubMedCrossRefGoogle Scholar
  7. — 1974a. Gemmiferous fern gametophytes—Vittariaceae. Amer. Fern J. 61: 146–165.Google Scholar
  8. — 1974b. Gemmiferous fern gametophytes: Vittariaceae. Amer. J. Bot. 61: 146–155.CrossRefGoogle Scholar
  9. — 1985. Independent fern gametophytes in the wild. Proc. Royal Soc. Edinburgh 86B: 361–369.Google Scholar
  10. — 1990. Species and evolution in asexually reproducing independent fern gametophytes. Sys. Bot. 15: 98–111 ill.CrossRefGoogle Scholar
  11. — 1998. The tropical flora of rockhouse cliff formations in the eastern United States. J. Torrey Bot. Club 125: 91–108.CrossRefGoogle Scholar
  12. — &R. D. Gooch. 1975. Fern reproduction at Woodman Hollow, central lowa: preliminary observations and a consideration of the feasibility of studying fern reproductive biology in nature. Proc. Iowa Acad. Sci. 82: 119–122.Google Scholar
  13. Gastony, G. J. 1988. ThePellaea glabella complex: electrophoretic evidence for the derivations of the agamosporous taxa and a revised taxonomy Amer. Fern J. 78: 44–67.CrossRefGoogle Scholar
  14. — &D. C. Darrow. 1983. Chloroplastic and cytolsolic isozymes of the homosporous fernAthyrium filix-femina L. Amer. J. Bot. 70: 1409–1415.CrossRefGoogle Scholar
  15. Nayar, B. K. &S. Kaur. 1971. Gametophytes of homosporous ferns. Bot. Rev. 37: 295–396.CrossRefGoogle Scholar
  16. Nitsch, J. P. 1951. Growth and development in vitro of excised ovaries. Amer. J. Bot. 38: 566–577.CrossRefGoogle Scholar
  17. Pence, V. C. 2000. Cryopreservation of in vitro grown fern gametophytes. Amer. Fern J. 90: 16–23.CrossRefGoogle Scholar
  18. Raghavan, V. 1989. Developmental biology of fern gametophytes. Cambridge University Press, Cambridge.Google Scholar
  19. Ranker, T. A. 1989. Spore morphology and generic delimitation of new worldHemionitis, Gymnopteris, andBomeria (Adiantaceae). Amer. J. Bot. 76: 297–306.CrossRefGoogle Scholar
  20. Sato, T. &A. Sakai. 1981. Cold tolerance of gametophytes of some cool temperature ferns native to Hokkaido. Can. J. Bot. 59: 604–608.CrossRefGoogle Scholar
  21. Smith, A. R. 1981. Pteridophytes.In: D. E. Breedlove, editor. Flora of Chiapas. 2: 1–370. California Academy of Sciences, San Francisco.Google Scholar
  22. — 1990. Thelypteridaceae. Pager 263–272.In: K. Kubitzki, editor. The families and genera of vascular plants. Springer-Verlag, Heidelberg.Google Scholar
  23. Tutin, T. G., V. H. Heywood, N. A. Burges, D. H. Valentine, S. M. Walters &D. A. Weeb. 1964. Flora Europaea. Cambridge University Press, Cambridge.Google Scholar
  24. Tryon, R. M. &A. F. Tryon. 1982. Fern and allied plants with special reference to tropical America. Springer-Verlag, New York.Google Scholar
  25. Vivant, P. 1970. Une localite francaise duThelypteris pozoi (Gag.). C. V. Morton. Bull. Soc. Bot. Fr. 117: 173–176.Google Scholar
  26. Watkins, Jr.,J. E. 2000. Origin and taxonomic affinities ofThelypteris pilosa (Martens & Galcotti) Crawford Thelypteridaceae Master's thesis. Iowa State University, Ames.Google Scholar
  27. — &D. R. Farrar. 2002. A new name for an old fern from north Alabama. Amer. Fern J. 92: 171–178.CrossRefGoogle Scholar
  28. Wendel, J. F. &N. F. Weeden. 1989. Visualization and interpretation of plant isozymes.In: D. E. Soltis & P. E. Soltis, editors, Isozymes in Plant Biology. Dioscorides Press, Portland.Google Scholar
  29. Yarabe, Y., T. Masayuki &N. Murakami. 1998. Variation in therbcL sequence ofStegnogramma pozoi subsp.mollissima (Thelypteriaceae) in Japan. J. Plant Res. 111: 557–564.CrossRefGoogle Scholar
  30. —,J. E. Watkins, Jr.,D. F. Farrar &N. Murakami. 2002. Genetic variation in populations of the morphologically and ecologically variable fernStegnogramma pozoi subsp.mollissima in Japan. J. Plant Res. 115: 29–38.CrossRefGoogle Scholar

Copyright information

© The New York Botanical Garden Press 2005

Authors and Affiliations

  • James E. Watkins
    • 1
  • Donald R. Farrar
    • 1
  1. 1.Department of BotanyIowa State UniversityAmesU.S.A.

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