Fern (Osmunda regalis) petiole. Light micrograph of a section through a petiole (leaf stalk) from a royal fern, showing the epidermis (outer layer, re

---

Fern (Osmunda regalis) petiole. Light micrograph of a section through a petiole (leaf stalk) from a royal fern, showing the epidermis (outer layer, red), chloroplasts (blue), endodermal cells (purple) and phloem sieve tubes (green). In the middle is the xylem, consisting of the metaxylem (large thick-celled, brown) and protoxylem (small thin-celled, brown). Magnification: x13 when printed 10 centimetres wide.

---

Size: 4394px × 4394px
Photo credit: © DR KEITH WHEELER/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: -, 1, anatomical, anatomy, background, biological, biology, botanical, botany, cell, cells, chloroplast, chloroplasts, cut, cut-, cut-outs, cutout, cutouts, endodermal, endodermis, epidermal, epidermis, fern, flora, histological, histology, leaf, light, metaxylem, micrograph, microscope, nature, osmunda, outs, petiole, phloem, plant, plants, protoxylem, regalis, royal, section, sectioned, sieve, single, stem, tissue, tube, tubes, vascular, white, wildlife, xylem