Fungitive is not a real word. It's a play on the words "fugitive" and "fungus." If you're looking to describe someone running away from a fungal problem, you could use "fugitive" or a more descriptive phrase like:
* "He fled from the mushroom-infested forest, a fugitive from the spores."
* "Desperate to escape the spreading mold, he became a wandering soul, seeking refuge from the fungal invasion."