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Caecomyces sympodialis sp. nov., a new rumen fungus isolated from Bos indicus

     Institute of Biotechnology, National Pingtung University of Science and Technology, Neipu Hsiang, Pingtung, 91201 Taiwan, R.O.C.

Chiu-Yuan Chien

     Department of Life Sciences, National Taiwan Normal University, Taipei, 10677 Taiwan, R.O.C.

Chun-Yi Hu

     Department of Nutrition and Health Science, Fooyin University, Taliao Hsiang, Kaohsiung, 83161 Taiwan, R.O.C.

Tai-Yi Cheng

     Yung-Ta Institute of Technology and Commerce, Pingtung, 90901 Taiwan, R.O.C.

A new anaerobic rumen fungus was isolated from the rumen fluid of a yellow cow (Bos indicus). This fungus appears to be a previously undescribed species of the genus Caecomyces, it possessing uniflagellate zoospores, a spherical holdfast, tubular sporangiophores and bulbous rhizoids. This new fungus also features distinctive multisporangiate thallus sympodially distributed on sporangiophores. The fungus resembles Caecomyces communis and C. equi in that it characterizes bulbous rhizoids and uniflagellate zoospores but differs from C. communis and C. equi in that it possesses multisporangiate and sympodial sporangia. This new fungus and Cyllamyces aberensis both reveal similar morphology during early thallus development in having a spherical holdfast, but they vary from unbranched sporangiophores and additional bulbous rhizoids. In addition, the molecular phylogenetic analyses ITS1 (internal transcribed spacer 1) also conform to the results of the morphological examinations of Caecomyces. For the mentioned reasons, this new species of fungus is described as Caecomyces sympodialis sp. nov. The genera of Neocallimasticaceae and species of Caecomyces are also keyed out.

Key words: anaerobic fungus, Bos indicus, ITS1 sequence analysis, Neocallimasticaceae

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