Fern frond, light micrograph (LM). Transverse section through the frond of a fern (Cyrtomium falcatum). A central vascular bundle (meristele) with central xylem tissue (red) surrounded by phloem (lblue) is visible. A trophophyll frond is a vegetative leaf analogous to the typical green leaves of seed plants that does not produce spores, instead only producing sugars by photosynthesis. A sporophyll frond is a fertile leaf that produces spores borne in sporangia that are usually clustered to form sori. Magnification: x25 when printed at 10 centimetres wide. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Gschmeissner, Steve |
Taille de l’image : | 5120 px × 3414 px |
Model Release : | Non requis |
Restrictions : | - |