Male pine cone, light micrograph

Male pine cone, light micrograph

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Caption: Pine cone. Light micrograph of a section through part of a male cone (strobilus) of a pine tree (Pinus sp.). On the undersides of the scale leaves (microsporophylls) are sac-like microsporangia (blue walls) full of developing microspore pollen grains (red dots). When the wall of a microsporangium splits open the grains are carried by the wind to the female strobilus. Magnification: x90 when printed at 10 centimetres wide.

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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

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