Indusium is found in

Step-by-step solution

Indusium is a membranous structure which covers a group of sporangia below it. It is differentiated, into a kidney-shaped dorsal plate called hood and a short stalk through which it remains attached with the undersurface of the pinnule at a swollen base called placenta. The sporangia attached with a placenta form group called sorus (pl. sori). Different types of sorus (simple, gradate, mixed) are seen to be present in a box like structure called sporocarp formed on the vegetative leaf, i e , frond of ferns. Such sp