Aerial roots of Hydrangea petiolaris
Numéro d’image : 11656004
| A one year old stem of Hydrangea petiolaris,growing amongst ivy (Hedera helix) against the wall of a house. The stem has produced adventitious aerial roots on its upper side.H. petiolaris is a woody climber; it uses aerial roots in order to attach itself to the bark of trees,to rocks,or,in gardens,to walls. The roots emerge on the side of the stem away from the light. In this picture,the upper side of the stem was deeply shaded by ivy leaves (removed). Underground roots of plants show geotropism; they grow downwards. In the case the of aerial roots shown here,growth is directed towards low light levels; the roots are growing upwards. They are destined never to reach the wall due to the presence of the ivy. The roots are approximately 2cm long; the distance between the stem and the wall is 6cm | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
| Taille de l’image : | 5212 px × 3468 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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