Shepherd's purse seed. Light micrograph of a longitudinal section through a seed of the shepherd's purse (Capsell bursa-pastoris),showing the embryo in the seed. The seed coat (testa) is a single layer of thick-walled cells covered with a thick cuticle. The embryo (bottom) has a large basal cell (white),a basal radical (above the white basal cell),then a short stalk (hypocotyl),then the top of the shoot (plumule,very small). Most of the seed consists of the large lamella-like cotyledons (pink),the first seed leaves. Magnification: x45 when printed at 10 centimetres high | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Wheeler, Dr. Keith |
Taille de l’image : | 3773 px × 4651 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |