Vessels and tracheids 126 Annular vessels 127 Spiral vessels 127 Sclariform vessels 128 Reticulate vessels 131 Pitted vessels 131 Pitted vessels with bordered pores 131 Sieve tubes 136 Sieve plate 138 Medullary bundles, rays and cells 138 Medullary ray bundle 139 The medullary ray 139 The medullary ray cell 141 Structure of the medullary ray cells 142 Arrangement of the medullary ray cells in the medullary ray 142 Latex tubes 142 Parenchyma 144 Cortical parenchyma 147 Pith parenchyma 147 Leaf parenchyma 150 Aquatic plant parenchyma 150 Wood parenchyma 150 Phloem parenchyma 150 Palisade parenchyma 150 CHAPTER VI AERATING TISSUE Water pores 151 Stomata 151 Relation of stomata to the surrounding cells 154 Lenticels 157 Intercellular spaces 158 CHAPTER VII SYNTHETIC TISSUE Photosynthetic tissue 163 Glandular tissue 164 Glandular hairs 164 Secretion cavities 166 Schizogenous cavities 168 Lysigenous cavities 168 Schizo-lysigenous cavities 168 CHAPTER VIII STORAGE TISSUE