| Gleicheniopsida |
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| Scientific classification |
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| | Orders |
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- Subclass: Gleicheniatae
- Gleicheniales (the forked ferns)
- Dipteridales
- Matoniales
- Subclass: Hymenophyllatae
- Hymenophyllales (the filmy ferns)
- Subclass: Hymenophyllopsitae
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The ferns in the class Gleicheniopsida were formerly all included in the order Polypodiales. However, it is clear that the ferns are much too diverse a group to be shoehorned into one order. In fact, it may be found that this class may even need to be divided into at least two classes.
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