(D) In $Dryopteris$,the spores are produced within specialized structures known as sporangia.These sporangia are typically grouped together in cluster

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(D) In $Dryopteris$,the spores are produced within specialized structures known as sporangia.These sporangia are typically grouped together in clusters called sori,which are located on the underside of the leaves (sporophylls).Therefore,the actual site of spore formation is the sporangium.