File:Parsons How to Know the Ferns 7th ed Plate 33.jpg
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![File:Parsons How to Know the Ferns 7th ed Plate 33.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Parsons_How_to_Know_the_Ferns_7th_ed_Plate_33.jpg/400px-Parsons_How_to_Know_the_Ferns_7th_ed_Plate_33.jpg?20150807184056)
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