Male pine cone, light micrograph

Male pine cone, light micrograph

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Caption: 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.

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

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