Underside of a fern leaf showing sori
Numéro d’image : 11527276
| The underside of an unidentified fern leaf. The numerous brown structures are sori each of which consists of many sporangia. Mother cells within the sporangia undergo meiosis to produce spores which are released when the sporangia dry out and split open. In conditions of continuous dampness a spore will germinate on the ground and form a haploid gametophyte. This structure develops archegonia containing ova and antheridia which produce motile spermatozoids. Although the gametophyte possesses organs of both sexes,cross-fertilisation often occurs resulting in a new fern plant,the sporophyte. From the Mazan cloudforest,Ecuador | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Read, Dr. Morley |
| Taille de l’image : | 2754 px × 4186 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
Prix pour cette image À partir de 45 €
Produit vendu
(Calendrier, Carte postale, Carte de vœux, Impression sur textile, Packaging etc)
À partir de 45 €
Usage commercial
(Affichage, Annonce presse, Annonce TV, Carte, Digital - hors rés. sociaux, Digital - rés. sociaux etc)
À partir de 45 €
Éditorial
(Digital, Journal, Livre, Livre pratique, Magazine, Télévision etc)
À partir de 60 €
Usage non-commercial
(Digital - hors rés. sociaux, Digital - rés. sociaux etc)
À partir de 120 €