Light micrograph of the surface of a leaf of the elder tree, Sambucus nigra. The small oval structures scattered over the surface are stomata (pores),

---

Light micrograph of the surface of a leaf of the elder tree, Sambucus nigra. The small oval structures scattered over the surface are stomata (pores), which provide the plant with a means of gaseous exchange between the atmosphere & the internal tissues. The pores are held open during the day & are closed at night to conserve water. Surrounding each stoma are two curved lip-like guard cells which control the opening & closing of the pore. Magnification: x200 at 35mm size.

---

Size: 5047px × 3480px
Photo credit: © POWER AND SYRED/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: botany, cell, elder, guard, image, images, leaf, leaves, light, magnified, micrograph, microscopic, nature, nigra, photos, plant, plants, sambucus, stomata, subjects