Sutural protrusion forms circular rim around spore, protruding c.0.7–0.9 above
surface of spore. In sutural view, small anterior and posterior sutural extensions seen at ends of spores. Sutural edge markings (5–7 in number) indistinct in fresh spores. Single binucleate sporoplasm with round iodinophilous vacuole present in spore. Mucous envelope not found.