Fern spore cases. Polarised light micrograph of a frond of the maidenhair fern (Adiantum capillus- veneris),showing the sporangia (black,centre left) which contain the fern's spores. The spores of some ferns are found in a structure called an indusium,but this fern does not have a proper indusium,and the sporangia occur under a marginal flap | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Wheeler, Dr. Keith |
Taille de l’image : | 5304 px × 3475 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |