Actinomycetes, like true bacteria (Eubacteria) are prokaryotes. Their growth (prothallus) is characterized by the formation of normally branching threads and rods, frequently giving rise to a typical mycelium, which is unicellular, especially during the early stages of growth (8). Generally non-septate, the hyphae may turn septate under special conditions (8). The mycelium is prostrate, i.e. vegetative, and growing in the substrate, or aerial, when a special mycelium is produced above the vegetative growth. Strains of streptomyces are characterized by the presence of an aerial mycelium under laboratory conditions. On the other hand, the aerial mycelium of nocardia, often invisible to the naked eye, may be altogether absent. Occasionally it may consist of few short filaments, which sometimes look like mere granules (8). Actinomycetes reproduce through special sporulating bodies or from parts of the vegetative mycelium