oidioid

/ˈɔɪdiɔɪd/
adjective
  1. Resembling or relating to an oidium (a type of fungal spore or a stage in certain fungi).
    • Under the microscope, the sample showed oidioid structures typical of powdery mildew.
    • Oidioid spores are often found in clusters on infected plant tissue.
    • The biologist identified the oidioid growth on the leaf as a common garden fungus.