| 21. | It differs from that species in having single sori at the base of fertile tertiary pinnules.
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| 22. | "C . cranhamii " has sori arranged in two rows on narrow pinnules.
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| 23. | Characteristically of this species, pinnule veins bear whitish scales with star-shaped setae . indusia.
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| 24. | They have no true gonads, producing their gametes from genital canals found inside some of the pinnules.
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| 25. | The sori are circular and present on the underside of the pinnules away from the margins ( edges ).
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| 26. | The specific epithet " dimorpha " refers to the strong morphological differences between fertile and sterile pinnules.
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| 27. | The smallest segments of the fronds are the pinnules, which are wedge-shaped, rectangular or trapezoid.
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| 28. | The arms are composed of articulating ossicles held together by ligaments, and the pinnules have a similar structure.
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| 29. | Like other sea lilies, gametes are produced in specialised areas of the pinnules and liberated into the sea.
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| 30. | In the Cyatheaceae, the sori occur away from the margins of the pinnules, and are elongate or rounded.
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