Q.Where do we find false indusium?

Step 1. In ferns, sori (clusters of sporangia) usually need a protective covering, called an indusium, while the spores mature.

Step 2. In Adiantum, the sori sit at the margin of the pinnule (leaflet), and the covering they receive is not a separate structure growing from the leaf surface.

Step 3. Instead, the leaf margin itself curls or folds back over the sorus, and this reflexed leaf-margin tissue is what protects the developing sporangia. …

Recall which named genus in the chapter has marginal sori protected by a …

• Confusing a false indusium (formed from the leaf margin) with a true indusium (a separate outgrowth of tissue covering the sorus). …