Defect Fern

This is a defect of a new leaf of a fern that I found in my garden. I am not sure why it can have such a defect, but it is not growing really well.

But it also give a nice result when I tried to shoot it in macro. Love the texture of it, and also how it curled.

When I see the other stem, some of them have already developed a nice leaf, not like this defective one, in which all of the leaves seem to shrink.