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  • Pinnae - the basic divisions of the frond of a fern
    Rights: Steve Attwood Published 29 March 2015 Size: 61 KB Referencing Hub media

    The basic divisions of the frond. Pinnae or leaflets may be arranged alternately or in opposite pairs along the midrib. If the frond is once divided, then it is 'pinnate'. More commonly fronds are divided into secondary pinnae and are 'bipinnate', or into tertiary pinnae and are 'tripinnate'.

    Image acknowledgement: Steve Attwood

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