The actinomycetes or ray fungi (7) are filamentous gram positive, spore-forming mycelial bacteria, characterized by a complex life cycle belonging to the phylum Actinobacteria, which represents one of the largest taxonomic units among the 18 major lineages currently recognized within the Domain Bacteria (8). They can produce branching mycelium which may be of two kinds viz., substrate mycelium and aerial mycelium. Among actinomycetes, the streptomycetes are the dominant. The non-streptomycetes are called rare actinomycetes, comprising approximately 100 genera.