| 11. | Longitudinal section of sorus attached superficially beneath lateral vein ( V ) of pinnule.
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| 12. | It has black stems and large flat pinnules.
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| 13. | The mouth is off centre and there are no pinnule combs after pinnule 3.
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| 14. | The mouth is off centre and there are no pinnule combs after pinnule 3.
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| 15. | The gametes are produced in specialised pinnules on the arms and fertilisation is external.
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| 16. | Fertilisation takes place in the water and the embryos are cemented to the pinnules.
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| 17. | They occur near the fertile pinnule midvein.
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| 18. | The sori are marginal on the pinnules.
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| 19. | The leaflets, or pinnules, overlapped one another and were subcircular to wedge-shaped.
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| 20. | It differs only in its smaller pinnae and pinnules, as well as other frond details.
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