Carpet has mushrooms growing along wall

Well thank you for the advice. I do appreciate all the input and advice I can get, when my husband gets home from work we will do what we can. I did put a call in to our insurance lady. I treated the area. I am a Chemist and I know 3 non toxic ways to kill black mold are 3% Hydrogen Peroxide, Tea Tree Oil and Vinegar. I have all 3 here. I will have him take out the carpet while wearing a mask. I will treat the area underneath as best I can. And ventilate. And search for a leak. This sounds like a monumental task to me and we have a trip planned this weekend. If we get the carpet out and treat the wood or subfloor underneath I guess thats a start. I am not using chemicals in the RV, they can be worse then mold. This appeared to be a fungus for certain though. And breathing any of them is deadly in a closed space. I am just sick to my stomach thinking about this. Its the newest RV we have ever had. I want my old Winnebago back. Should we even bother calling the place we purchased it from, they were the ones who replaced the wall on that side last fall.