"This one defeats me!"
...and we are none the wiser either.
"This one defeats me!
Was it growing in a wet or
dry place; and is a wild
or a garden fern? In a
hedgebank or on a wall?
It's a bit like the Black
Spleenwort, but the stem is
green and not black!
Also, if the back of the
leaves don't have spores
(as in the Polypody)
identification is more difficult."