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Recharacterization and Emended Description of the Genus Mycoplana and Description of Two New Species, Mycoplana ramosa and Mycoplana segnis

¹Niigata Research Laboratory, Mitsubishi Gas Chemical Co., Tayuhama, Niigata 950-31, Japan
²Japan Collection of Microorganisms, The Institute of Physical and Chemical Research, Wako-shi, Saitama 351-01, Japan
³Institute of Applied Microbiology, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan

^* Corresponding author.

ABSTRACT

The phenotypic and chemotaxonomic characteristics of Mycoplana strains were examined. These strains were gram-negative, peritrichously flagellated, branching, filament-forming bacteria. The cellular fatty acids consisted of large amounts of straight-chain unsaturated C_18:1 acid, as well as straight-chain saturated C_16:0 acid and unsaturated C_16:1 acid. The major ubiquinone was ubiquinone Q-10. The Mycoplana strains were divided into four groups, including one group containing Mycoplana dimorpha ATCC 4279^T (= IFO 13291^T = NCIB 9439^T) (T = type strain) and another group containing Mycoplana bullata ATCC 4278^T (= IFO 13290^T = NCIB 9440^T), on the basis of DNA base composition, major hydroxy fatty acid composition, mucosity of colonies, acid production from sugars, and utilization of carbon compounds. This division into groups was supported by the results of DNA-DNA homology experiments. Two new species, Mycoplana ramosa and Mycoplana segnis, are proposed. The type strain of M. ramosa is strain TK0053 (= NCIB 9440), and the type strain of M. segnis is strain TK0059 (= IFO 13240 = ATCC 21756).

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