These were growing under my chair. Some questions...

Wear a mask, clean in an open space, buy and use a dehumidifier, maybe slather some a new paint job on the walls, vacuum more often.

Far as I remember, white - yellow is standard variety and less harmful. Red - black though, that's when you're fucked.

Accepting corrections.

I am pretty sure this is how some zombie apocalypse stories start

I am not a mycologist, but I think any form of fungi IN HOUSE is not good :D OP I hope this is not your in house chair.