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Streptomyces colonies on agar Streptomyces mycelium
Streptomyces forms one of the most important antibiotic-producing bacterial groups. It is a filamentous actinomycete with hyphae and (external) spores. The colonies seen in this photo show the presence of the mycelium and the colorful spores.
Bergey's Manual Volume 4: The high G+C Gram-positive Bacteria