Hi Liana, here's great article that will help you identify and get rid of the fungus on your palm tree - https://homeguides.sfgate.com/remove-black-fungus-palm-trees-41937.html
Here's an article that might help you - https://www.hunker.com/12524475/how-to-cure-palm-tree-fungus
Hi Liana, reach out to your local Cooperative Extension. They can help you figure out what type of palm and what fungus is attacking it. Good luck!