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Pine tree ovule

Pine tree ovule

B500/0314

Rights Managed

34.5 MB (6.4 MB compressed)

4252 x 2835 pixels

36.1 x 23.9 cm ⏐ 14.2 x 9.4 in (300dpi)

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Credit

HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY

Caption

Pine tree ovule. Light micrograph of a section through a pine tree (Pinus sp.) female sporangium, or macrosporangium. At centre right is the ovule (green), which will develop into two eggs, the females gametes (sex cells). It is surrounded by integument (red), a protective layer of cells. The whole structure is known as a macrosporangium. The gap between the two sides of the integument is the micropyle. During pollination male sex cells (pollen grains) enter through the micropyle. Pine tree macrosporangia are found on each scale of a pine cone and can take 2 to 3 years to mature. Magnification: x200 when printed at 10 centimetres wide.

Release details

Model release not required. Property release not required.

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