The Actinobacteria, or Actinomycetota are a group of Gram-positive bacteria. They grow on land or in water. They include some of the most common life forms in soil, playing important roles in the decomposition of organic matter and humus formation. Fungi also play the same role, so some Actinobacteria like Streptomyces were originally classified as fungi. Actinobacteria colonies form branching threads called mycelia. This feature was another reason for the wrongful classification of the actinomycetes, for example, as fungi.
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