J. Gen. Appl. Microbiol., 51, 229–234 (2005)

The genus Micromonospora Ørskov 1923 belongs to the family Micromonosporaceae (Stackebrandt et al., 1997) and currently encompasses 18 validly described species (the type strain NTCT 4582 of Micromonospora gallica is not available any longer, Kawamoto, 1989), including the recently described species M. eburnea, M. aurantinigra, M. endolithica and M. mirobrigensis (Hirsch et al., 2004; Thawai et al., 2004, 2005; Trujillo et al., 2005). This genus is well established according to its morphological and chemotaxonomic properties (Kroppenstedt, 1985; Lechevalier and Lechevalier, 1970; Lechevalier et al., 1977) as well as through 16S rDNA-based phylogenetic analysis (Stackebrandt et al., 1997). During investigation of new actinomycetes from peat swamp forest soil in the southern area of Thailand, we isolated strain TT2-4 showing typical morphological characteristics of the genus Micromonospora and it was genotypically and phenotypically distinguished from all validly described Micromonospora species. In this paper, we report taxonomic characterization and classification of this isolate and propose a new species Micromonospora siamensis sp. nov. for the strain. Micromonospora siamensis sp. nov., isolated from Thai peat swamp forest