Characteristics and nutrition of Actinomycetes: Actinomycetes are heterotropic in nature. Most of them are strict saprophytes, while some from parasitic or mutualistic associations with plants and animals. Actinomycetes are commonly believed to have a role in the recycling of nutrients. They are aerobic and some like Actinomyces are anaerobic. The species like Frankia require very specialized growth media and incubation conditions 5 . Many actinomycetes are growing on the common bacteriological media used in the laboratory such as nutrient agar, trypticase agar, blood agar, brain heart infusion agar and starch casein agar. Sporoactinomycetes require special media to allow differentiation and the development of characteristic spores and pigments.