any bacteria (some of which are pathogenic for humans and animals) belonging to the order Actinomycetales

A Gram-positive bacterium that grows vegetatively in a branched filamentous form.

Bacteria resembling fungi because they usually produce a characteristic, branched mycelium.

Any member of the order Actinomycetales; the name is often used to refer specifically to those species which form mycelium. (pl. actinomycetes). ( 16)

A group of microorganisms, intermediate between bacteria and true fungi, that usually produce a characteristic branched mycelium. These organisms are responsible for the earthy smell of Compost.