|All of my cinnamon ferns have something growing on the back of each leaf. The fungus, if that, is a series of small circles, each about the size of the head of a ball point pen. The circles forms in two or three rows of the back of a healthy leaf. It starts (the circles) out pale green and eventually turn brown. Each leaf as it is affected slowly shrinks and curls, like the life is being sucked out. The fungus starts at the tips of frond and spreads inward. No other plants in my otherwise healthy garden are affected. I have no other ferns. What is it and how do I get rid of it? It started last summer and came back this year.