<prompt> Medusahead appearance on agar plates is characteristic ofHemophilusPneumococcusBacillusYersinia  <response>: When grown on blood agar plates, Bacillus anthracis produce nonhemolytic grey to white, tenacious colonies with a rough texture and a ground-glass appearance. Comma-shaped outgrowths Medusa head, curled hair may project from the colony.Jawetz 27e pg: 180 