If something is subcoriaceous, it is slightly leathery in texture, like a leaf.
Subcoriaceous is a word used to describe the texture of something, like a leaf.
Examples:
The leaf is subcoriaceous, not soft like a flower.
The skin of the fruit is subcoriaceous, not like the skin of the apple.
The subcoriaceous shell protects the nut inside.
The subcoriaceous book cover feels like a leaf.
The subcoriaceous material is tough and strong, like a leaf.
The subcoriaceous bag feels like a leaf, but it's not a leaf.