Fern sorus. Fluorescence light micrograph of a sorus on the underside of a fern frond. A sorus is a cluster of spore-producing receptacles called sporangia (green and brown). The sporangia are protected under an umbrella-like scale called an indusium (yellow). Each sporangium is packed with spores (brown), which are the fern's reproductive cells. A rim of thick-walled cells, the annulus (green), functions to open and rapidly close each sporangium when the spores are mature, releasing them into the environment. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / ROGELIO MORENO |
Bildgröße: | 5173 px × 3449 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |