Female pine cone, light micrograph

Female pine cone, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Female pine cone. Light micrograph of a longitudinal section through the female cone (strobilus) of a pine tree (Pinus sp.). The cone has a central axis (dark blue), from which emanate woody ovuliferous scale leaves (megasporophylls, dark purple to dark orange). At the base of each, on the upper side, are two sac-like megasporangia (thick purple walls) inside which is an elongated spherical ovule (dark red-purple). The ovule consists of outer integuments, inside which is the nucellus (megasporangium) which contains the megagametophyte containing two eggs (not seen). Magnification: x6 when printed 10 centimetres wide.

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Keywords: biological, biology, botanical, botany, cell, cell biology, cells, cone, conifer, coniferous, cytology, developing, female, flora, gymnosperm, gymnosperms, integument, integuments, leaves, light micrograph, light microscope, lm, loniudnal section, megasporangia, megasporangium, megaspore, megaspores, megasporophyll, megasporophylls, nature, nucellus, ovule, ovuliferous, part, parts, pine, pinus sp., plant, plant structure, reproductive structure, scale leaf, sectioned, sporophyll, sporophylls, strobilus, structures, tree, white background

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