The first mention of the stalked (prosthecate?), sulfur bacterium Thiodendron occurred in 1961 (Perfil’ev and Gabe, 1961). Studied only by PerfiTev (1969), and observed by few others (Hirsch, 1974) since the initial description, these are rare bacteria which have a complex cycle of development with “peculiar” structure and physiology; they were described by Perfil’ev and Gabe (1961) as a new group of iron-sulfur bacteria. According to G. A. Zavarzin (personal communication), Thiodendron should be considered as a sort of hyphomicrobium, as the observations of Perfil’ev (1969) strongly suggest.
KeywordsMethylene Blue Hydrogen Sulfide Colloidal Sulfur Complex Cycle Coccoid Cell
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