Rental with mold

In two bedrooms we have a black mold growing in the corners of the rooms along the wall adjoining the outside of the house. A light, dusty green mold is growing along the shelves against that wall. I try to keep it under control with Tilex, but how do I know if it is dangerous to our health? I’ve mentioned it to our landlady (left a voice message) but she was totally unresponsive. She tends to be difficult to deal with if something needs done.