SEM image of the sporangia,(spore sacs),of the Male Fern. The sporangia are borne on the undersides of the leaf fronds in brown,kidney-shaped structures known as sori. Each sporangium is a biconvex capsule in which the mature spores lie freely. As the mature sporangium dries,the tension in the walls of the annulus causes the sporangium to rupture,expelling the spores which are then distributed by the wind. The calibration bar is 20 um and the image was collected at a magnification of 2,280x | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Kinsman, Ted |
Taille de l’image : | 3600 px × 2850 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
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