Sulphur granules in actinomycosis consist of

Sulphur granules are examined microscopically. They are crushed between slides and stained by gram stain and examined. The granules are bacterial colonies and will be found to consist of a dense work of thin gram-positive filaments surrounded by a peripheral zone of swollen, radiating club-shaped structures (antigen-antibody complex) presenting a sun-ray appearance. Ref: Textbook of microbiology; Ananthanarayan and paniker's; 10th edition; Pg:398