family mycobacteriaceae
the family consists of only the genus Mycobacterium. these are gram- positive, noncmotile, aerobic, non-sporeforming rods. the Ziehl-Neelsen stain is of special value in the identification of mycobacteria, since they are unique in being strongly acid-fast. morphologically, they are much like ordinary bacteria except for being somewhat curved and spindle-shaped, and showing beaded or granular cells. the granules are often called Much granules after the first writer to describe them. they have been regarded as forms in a life cycle of tubercle bacillus or nuclear apparatus. the most acceptable view at present is that they are artifacts resulting from staining processes. the mycobacteria branch only slightly, so that X, Y, L and similar forms are sometimes seen. filament formation is minimal and transitory. most of them are harmless saprophytes living in the soil and decaying organic matter. none of them forms conidia or aerial hyphae.
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