What Is Indusium in Botany?

Indusium. (Science: botany) tissue covering the sorus of a fern.

What does indusium mean?

: an investing outgrowth or membrane especially : an outgrowth of a fern frond that covers the sori.

What is the function of indusium?

A flap of tissue that protects the sori in some ferns. This can take a variety of forms. When spores are mature and ready for release, the indusia usually shrivel or bend backwards to expose the sporangia.