Medusahead appearance on agar plates is characteristic of
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
Hemophilus
Pneumococcus
Bacillus
Yersinia
Bacteriology