Figure 4 in A unique seasonal cycle in a leaf gall-inducing insect: the formation of stem galls for dormancy

Figure 4. Rollinia laurifolia lenticel ontogenesis. (A) Young stem with epidermis covered by cuticle and adjacent cortical parenchyma. (B) Phellogen differentiation from the external cortical parenchyma layer. (C) Young lenticel with first divisions of phellogen and suber deposition. (D) Mature lenticel with complementary cells (white arrow) and closing layer (black arrow). Cortical parenchyma (cp), epidermis (ep), phellogen (pg). Scale bar: 25 mm (A– C), 100 mm (D).