There are thousands of known species of molds, and they come in many different colors. Some are considered more toxic than others. Stachybotrys chartarum is the most commonly known black mold, but I’ve been told that there are some molds even more toxic.
Just to give you some idea of which molds might indicate there has been an water issue in your home, the ERMI Carpet Sampling test looks for 36 different molds, and compares your results against the EPA database of moldy and healthy homes:
For more info, visit https://www.understandingmold.com/what-do-i-do-now/mold-in-the-home/