An oil is contained in prominent glands on the leaf surface.

So much silk may be deposited within the mine that the lower leaf surface appears white.

There are spores everywhere, all over the leaf surface, and some of those end up in a wound.

Later, irregular projections cover the greater part of the leaf surface.

They block too much wind from moving across the leaf surface.

It will move its hind wings down toward the leaf surface.

Young larvae feed between veins on the lower leaf surface.

The sides of the case are usually adorned with hairs from the leaf surface.

The mine is located on the underside of the leaf surface.

Must have been pretty stuffy, just the same; you were short on green leaf surface.