Todzillaanswered grow question a month ago Hi! You have a fungus my friend. This shows usually in wet humid weather.
Blowing fans on them or moving them to a dry location will help.
In my experience, fungus infestations are difficult to cure. Lowering the humidity - significantly - to under 60, preferably 40, is needed. This is difficult to achieve outdoors.
Cut the fungus leaves out to prevent the spread, get some airflow and get them in a dry environment at night.
Best of luck in your grow.