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HyphomicrobiumRANK: GenusTAXONOMY: cellular organisms -> Bacteria -> Proteobacteria -> Alphaproteobacteria -> Rhizobiales -> Hyphomicrobiaceae -> Hyphomicrobium OVERVIEW: Cells 0.3–1.2 × 1–3 µm; rod-shaped with pointed ends, or oval, egg-, or bean-shaped; produce monopolar or bipolar filamentous outgrowths (hyphae or prosthecae) of varying length and 0.2–0.3 µm in diameter. Hyphae are not septate, but hyphal cytoplasmic membranes show conspicuous constrictions. Hyphae may be truly branched; secondary branches are rare. Cells stain with carbol fuchsin, but stain weakly with aqueous aniline dyes. Gram negative and non-acid-fast. Do not form spores.The mol% G + C of the DNA is: 59–65 (Tm).Type species: Hyphomicrobium vulgare |