Final answer:
Cryptococcus neoformans is the fungus that causes true systemic infections which can disseminate into meningitis, osteomyelitis, and skin granulomas.
Step-by-step explanation:
The fungus that causes true systemic infections which can disseminate into meningitis, osteomyelitis, and skin granulomas is Cryptococcus neoformans. Cryptococcus neoformans is a fungal pathogen that can cause cryptococcal meningitis. It is commonly found in soils and is particularly associated with pigeon droppings. The infection can progress to cause meningitis and granuloma formation in brain tissues.