Epiphytism and terrestrialization in tropicalHuperzia (Lycopodiaceae)

A phylogenetic analysis ofHuperzia (Lycopodiaceae) documents a single origin of epiphytism and multiple reversals to a terrestrial habit in the Neotropics. Epiphytism evolved prior to the final rifting of South America and Africa, but the origin of most modern species diversity probably postdates th...

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Bibliographic Details
Published inPlant systematics and evolution Vol. 218; no. 3-4; pp. 221 - 243
Main Authors Wikstr m, N., Kenrick, P., Chase, M.
Format Journal Article
LanguageEnglish
Published Heidelberg Springer Nature B.V 01.09.1999
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Summary:A phylogenetic analysis ofHuperzia (Lycopodiaceae) documents a single origin of epiphytism and multiple reversals to a terrestrial habit in the Neotropics. Epiphytism evolved prior to the final rifting of South America and Africa, but the origin of most modern species diversity probably postdates the Mid Cretaceous diversification of flowering plants. In this respect, the evolution ofHuperzia parallels that of many other Neotropical epiphytic groups. In the Andes, alpine terrestrial species are shown to have evolved from montane epiphytes, an event that correlates well with regional orogenesis during the Miocene. Species from Australia, New Zealand, and Tasmania show diverse relationships with SE Asian groups. Results also indicate that long distance, transoceanic dispersal is rare in these homosporous plants — accounting for less than 5% of species distributions — and that convergence in strobilus and branch morphology is widespread among Paleotropical and Neotropical epiphytes. The phylogenetic analysis is based on a sample of 63 species (c. 15% total species diversity) and data from a c. 1.1kb region of noncoding (intron and spacer sequences) plastid DNA located between thetrnL andtrnF genes.
ISSN:0378-2697
1615-6110
2199-6881
DOI:10.1007/BF01089229