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Molecular systematics of the Asplenium nidus complex from Mt. Halimun National Park, Indonesia: evidence for reproductive isolation among three sympatric rbcL sequence types¹

²Department of Botany, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwake-cho, Kyoto 606-8502, Japan ³Faculty of Contemporary Culture, Tokyo Woman's Christian University, Zempukuji, Suginami-ku, Tokyo 112-8551, Japan ⁴Botanical Gardens, Bogor, Jl. Ir. H. Juanda 13, Bogor 16122, Indonesia

Asplenium nidus is an epiphytic fern with large simple leaves. Because A. nidus lacks the good taxonomic characters available for species recognition, multiple cryptic species may exist within A. nidus. In Mt. Halimun National Park, West Java, Indonesia, three rbcL sequence types of A. nidus were recorded. All plants regardless of rbcL sequence were 2n = 144. Crossing experiments among these rbcL types were conducted, and it was observed that the molecularly distinct types were reproductively isolated because hybrids failed to form between at least two pairs of rbcL types. These results suggest that these rbcL types are cryptic species because they are reproductively isolated but they are difficult to distinguish morphologically. Thus, the characters of DNA sequences information are useful in the discovery of cryptic species in ferns.

Key Words: Asplenium nidus complex • molecular systematics • rbcL • reproductive isolation

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