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Female pine cone scales. Light micrograph of a section through two scales from a young ovulate female Scot's pine (Pinus sylvestris) cone, bearing ovules (large, oval). Each scale supports a lower basal bract scale (top). On the upper ovuliferous scale there is a basal bare ovule (central oval with white space), surrounded by the integument and nucellar tissue (around the ovule), which is pierced by a tube, the micropyle (shown in the upper scale). The micropyle enables the pollen to reach the top of the archegonium (circular brown cells) where the egg (ovum) will reside. Magnification: x37 when printed 10 centimetres wide.

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