Fern frond,light micrograph. Transverse section through the frond of a fern (Cyrtomium falcatum),showing the sporangia. At left is a central vascular bundle (meristele) with central xylem tissue (red) surrounded by phloem (light green). On the underside of the frond are two sori (right) each consisting of an umbrella-shaped indusium with a handle-shaped base (placenta),from which protrude numerous stalked sporangia (containing the reproductive spores). Magnification: x19 when printed at 10 centimetres wide | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wheeler, Dr. Keith |
Bildgröße: | 5138 px × 3425 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |