Sewing needle and spine of cactus,Opuntia
Numéro d’image : 11537352
| Scanning electron micrograph of the spine of Opuntia aurantiaca,a cactus,resting near the point of a sewing needle. The spine is about 15mm long with barbs on the terminal 2mm. They are designed to slide in easily & withdraw painfully,more likely,break off in the skin. Spines protect the plant from grazing animals,an important function in the arid regions where they grow. In some cases the spines & bristles (glochids) form a dense covering over the stem,sheilding it from sunlight. Spines develop from stem buds,which in cacti are paired; the lower one forms the spine,the upper one,flowers or branches. Magnification: X130 at 10x8 inch,X37 at 6x7cm size | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
| Taille de l’image : | 3826 px × 4939 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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