Final answer:
True: granules are typical in mycetoma caused by Nocardia but not commonly seen in nocardiosis.
Step-by-step explanation:
The statement that granules are seen in mycetoma caused by Nocardia, but in nocardiosis, granules are usually not observed, is True. Mycetoma, also known as Madura foot, is a chronic granulomatous infection of the skin and subcutaneous tissues, characterized by tumefaction, sinus tracts, and the presence of granules which are aggregates of the causative organism that are visible in the discharge from sinus tracts. These granules are typically not seen in nocardiosis, which refers to a range of conditions caused by infection with Nocardia species, involving the lungs, brain, or skin but without the classic presentation of mycetoma.