Pine cone. Light micrograph of a section through a male cone (strobilus) of a pine tree (Pinus sp.). The cone has a central axis, from which emanate s

---

Pine cone. Light micrograph of a section through a male cone (strobilus) of a pine tree (Pinus sp.). The cone has a central axis, from which emanate scale leaves (microsporophylls). On their undersides are sporophylls bearing sac-like microsporangia (thin blue walls) full of developing microspore pollen grains (blue dots). When the wall of a microsporangium splits open the grains are carried by the wind to the female strobilus. Magnification: x10 when printed at 10 centimetres tall.

---

Size: 3456px × 5184px
Photo credit: © ANTONIO ROMERO/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: aeroallergens, allergen, anatomy, background, biological, biology, botanical, botany, cell, cone, conifer, flora, gamete, grains, gymnosperm, histology, light, lm, longitudinal, male, micrograph, microscope, microsporangia, microsporangium, microspore, microspores, monoecious, nature, palynology, pine, pinus, plant, pollen, reproduction, reproductive, section, sectioned, sex, sporophyll, strobilus, structure, tree, vascular, white