Female pine cone. Light micrograph of a longitudinal section through the female cone (strobilus) of a pine tree (Pinus sp.). The cone has a central axis (dark blue),from which emanate woody ovuliferous scale leaves (megasporophylls,dark purple to dark orange). At the base of each,on the upper side,are two sac-like megasporangia (thick purple walls) inside which is an elongated spherical ovule (dark red-purple). The ovule consists of outer integuments,inside which is the nucellus (megasporangium) which contains the megagametophyte containing two eggs (not seen). Magnification: x6 when printed 10 centimetres wide | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wheeler, Dr. Keith |
Bildgröße: | 4252 px × 5616 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |