A New Genus of the Actinomycetales: Microtetraspora gen.nov.

Actinomadura malachitica and Microtetraspora viridis Are Synonyms and Should Be Transferred as Actinomadura viridis comb. nov.

“…In 1968 Thiemann et al (24) established the genus Microtetraspora, whose members were characterized by the formation of linear chains of four spores borne on short sporophores a For fatty acid compositions see Table 5. Thiemann et al found that the aerial mass color was gray to whitish gray (24).…”

“…intermedia JCM 3113T by using various criteria, including DNA-DNA hybridization, in order to clarify the taxonomic relationships of these organisms. In addition, we studied the taxonomic status of the genus Microtetraspora Thiemann et al (24) by using the type strains of species belonging to the genus Microtetraspora and related genera.…”

Taxonomy of the antibiotic Bu-2313-producing organism, Microtetraspora caesia sp. nov.

“…Four species of the genus Microtetraspora described by THIEMANN et al 21) and NONOMURA & OI-IARA 10,11) produce chains of tetraspores, on short sporophores.…”

“…According to the morphological descriptions for the genus Microtetraspora by THIEMANN et al 21), the chains of tetraspores on short sporophores branch from the aerial mycelium at an upward angle of 45', "giving to the sporophores, when examined en masse an appearance reminiscent of an ear of wheat". Since the secondary branching of spores or spore-chains of strain E864-61 forms a downward angle of 45' relative to the sporophore, strain E864-61 is different from Microtetraspora glauca or M. fiusca which forms upward spore-chain branching at an angle of 45'.…”

Planotetraspora thailandica sp. nov., isolated from soil in Thailand

“…The DNA G+C content is 70-71 mol%. The genus Planotetraspora is related closely to the genera Microbispora (Nonomura & Ohara, 1957), Microtetraspora (Thiemann et al, 1968), Herbidospora (Kudo et al, 1993) and Acrocarpospora (Tamura et al, 2000). Members of these genera exhibit high 16S rRNA gene sequence similarity to the genus Planotetraspora, but the genus can be distinguished from the other four genera on the basis of morphological and chemotaxonomic criteria.…”