Figure 8.

Cytomorphology of Larix decidua needles. (A) Uninfested (Adelges laricis-free) elliptical shaped needle; the enlargement shows one layer of thin-walled epidermal cells covered with thin layer of wax and mesophyll cells with highly wrinkled walls; (B) Adelges laricis-infested needle, flattened laterally; the enlargement shows one layer of cone-shaped epidermal cells, with the apex directed outwards and very thick layer of polar-arranged wax, and numerous mesophyll cells with poorly wrinkled walls. 1—epidermis; 2—hypodermis; 3—mesophyll; 4—vascular bundle; 5—resin duct, 6—endodermis.