40.1 MB (1.9 MB compressed)
3744 x 3744 pixels
31.8 x 31.8 cm ⏐ 12.5 x 12.5 in (300dpi)
DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Thornapple seed. Light micrograph of a section through a seed from a thornapple (Datura stramonium) plant. The seed contains two coalescent carpels and two rows of seeds. When ripe, the capsule splits into four. From outside to the centre: testa (surface) of the seed; pericarp (yellow); endosperm (brown-yellows), which stores nutrients of starch and proteins; embryo; two cotyledons, in between the plumule, and the radical and in between the hypocotyl. Magnification: x5, when printed 10 centimetres wide.
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