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Rights: Museum of New Zealand Te Papa Tongarewa Published 24 September 2010 Size: 29 KB

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. Occasionally, if the indusia completely cover the sporangia. they may tear irregularly.

Image acknowledgement: Museum of New Zealand Te Papa Tongarewa