hormogonium

/ˌhɔːrməˈɡoʊniəm/
noun
  1. A single small, motile filament produced by certain bacteria (cyanobacteria) for reproduction and dispersal.
    • Hormogonium formation is an important part of the cyanobacterial life cycle.
    • Each hormogonium can grow into a new colony of bacteria.
    • The biologist observed a hormogonium breaking away from the main filament.