| Summary: | 碩士 === 國立中興大學 === 植物病理學系所 === 99 === Ophiostomatoid fungi are important in forest ecology. Some species can cause serious tree diseases. While most species are the causal agent of blue stain appearing on sapwood. Ophiostomatoid fungi are usually associated with insects, especially bark beetles, which serve as vectors for dispersing these fungi. Ophiostomatoid fungi include the genera of Ophiostoma, Ceratocystiopsis, Grosmannia, Ceratocystis, and their anamorphs, such as Pesotum, Sporothrix, Hyalorhinocladiella, Leptographium, Thielaviopsis. The aim of this study was to survey the diversity of ophiostomatoid fungi in Taiwan, and to look into their taxonomy. In realizing ecological properties of these fungi during this study, adequate approaches have been applied to obtained specific ophiostomatoid fungi. However some fungi, although not in the definition of ophiotomatoid fungi, share characters with ophiotomatoid fungi and are morphologically indistinguishable from them. Species of Graphium and Chalara are the most significant examples. Graphium shares with Pesotum in having the characters of synnemata and slimy spore masses. Chalara shares with Thielaviopsis in having the characters of phialidic conidiogeneous cells with long-collarette and endogenous conidia. The convergent evolution of these ophiostomatoid allied fungi makes the taxonomy of ophiostomatoid fungi complicated. To clarify their taxonomy, those ophiostomatoid allied fungi are also involved in this study. Species identifications were carried out by combining the data from morphology and phylogenetic analyses. Eventually 10 ophiostomatoid fungi and 9 ophiostomatoid allied fungi were found. Among them, 7 species are new species. The result suggests that there are diverse ophiostomatoid and allied fungi awaiting to be discovered in Taiwan. By clarifying the taxonomy and identification of these fungi, the basis for further researches on these fascinating fungi in Taiwan is established.
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