I have a leaf of sweet chestnut that is how a lace with only the net of
the finest ribs, without green cells. I saw the same with leaves of others
plants.

Who is able to say me how is possible to obtain that leaves? BRBR

That is usually caused by insects eating the rest of the leaf.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)