Common horsetail spore. Coloured scanning electron micrograph (SEM) of a spore of a common horsetail (Equisetum arvense) plant. The spore (green) bears elaters (grey) that expand and contract with changes in humidity. Elaters help to tangle spores together into a clump called a propagule,and to dig spores into the soil. A spore is part of the sexual reproduction of this plant,and horsetails normally use asexual reproduction using rhizomes (underground stems). Horsetails are the only living group of a primitive family of plants,the Sphenopsids,that date back to the Devonian period,355-410 million years ago. Magnification: x555 at 6x7cm size | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Power And Syred |
Taille de l’image : | 3500 px × 2355 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |