Identification of ferns:
Sorus & indusium
![](../assets/img/content/fern/fern_sori_n_indusium_ex_4.png)
The position of sori can be described as
marginal,
![](../assets/img/content/fern/sori 1.png)
![](../assets/img/content/fern/sori 1.png)
intramarginal,
![](../assets/img/content/fern/sori 2.png)
![](../assets/img/content/fern/sori 2.png)
or superficial
![](../assets/img/content/fern/sori 3.png)
![](../assets/img/content/fern/sori 3.png)
The intramarginal sori are protected by a false indusium.