Viewing post #862889 by Swayback

tarev said:I would just further observe it. If it does not appear spreading, I prefer to leave it alone. Sometimes, the more you disturb, the more you spread it. Sometimes plants have their own mechanism to deal with it. Give it time, continue to keep it dry if your temps still are cold or your humidity is high.

Tarev is probably right, good culture is often the best cure for fungus issues, especially if it's not advancing rapidly.
Every time I see that black spot, it goes on and clears up pretty fast, but you will lose the leaves that are affected.

That's species, with smaller leaves, seems the most susceptible.