Actinomycetaceae

noun plural

Ac·​ti·​no·​my·​ce·​ta·​ce·​ae -ˌmī-sə-ˈtā-sē-ˌē 

: a family of filamentous or rod-shaped bacteria of the order Actinomycetales that are often branched, sometimes produce conidia, and sometimes form a mycelium that readily breaks up into bacillary elements