The leaves are described from the bottom left, clockwise.
Possibly the lower surface of a leaf of Zelkova (Ulmaceae).
Lower surface of an unknown leaf
Lower surface of a leaf of Philadelphus (Hydrangeaceae).
Possibly the lower surface of a leaf of Ribes (Grossulariaceae).
Lower surface of a leaf of Prunus (Rosaceae).
Lower surface of an unknown leaf.