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Rights: University of Waikato
Published 24 September 2010, Updated 5 April 2018 Referencing Hub media
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Sori are clumps of sporangia that hold the reproductive spores. They are found on the underside of fern fronds. 

Transcript

Dr Leon Perrie

The sporangia is the structure which produces spores. In ferns, the sporangia are usually aggregated into particular bigger structures. If you turn over a fern frond and you might see lines, and those are aggregations of the sporangia.

Video: © University of Waikato