| 1. | The prothallus development is of the " Adiantum " type.
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| 2. | It has a black or bluish or greenish prothallus.
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| 3. | The prothallus is usually absent when growing on rock.
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| 4. | A rim of dark tissue ( prothallus ) may surround the edges of the lichen.
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| 5. | The prothallus is red to whitish in the inner part, red the in outer part.
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| 6. | The cordate prothallus are usually smaller with thinner midribs than that of other members of Polypodiaceae.
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| 7. | The prothallus is either absent or vestigial, with areoles sometimes being contiguous and sometimes scattered.
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| 8. | Young fern sporelings can often be found with the prothallus gametophyte still attached at the base of their fronds.
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| 9. | A thin strip of prothallus sometimes is at the outer edge, forming a narrow dark zone ( fimbriate ).
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| 10. | In ferns the gametophyte is a small flattened autotrophic prothallus on which the young sporophyte is briefly dependent for its nutrition.
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