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Osmunda spectabilis : ウィキペディア英語版 | Osmunda spectabilis
''Osmunda spectabilis'' is a species of fern once thought to be the same as ''Osmunda regalis'', but recent genetic studies have shown it to be a separate species.〔Metzgar, Jordan S., Judith E. Skog, Elizabeth A. Zimmer, and Kathleen M. Pryer (2008). "The Paraphyly of Osmunda is Confirmed by Phylogenetic Analyses of Seven Plastid Loci." Systematic Botany http://www.pryerlab.net/publication/fichier1090.pdf〕 ==Description==
''Osmunda spectabilis'' is an easy fern to recognize in the New World flora. Although it closely resembles species ''O. regalis'', ''O. japonica'', and ''O. lancea'', only ''O. spectabilis'' is found growing naturally in the New World. The fronds of ''O. spectabilis'' can exceed 1 meter in length and are bipinnate. The pinnules are attached by a very narrow base. The plant produces separate sterile and fertile fronds. Fertile fronds are similar to the sterile fronds, in the lower and middle portions, but the top-most pinnae are fertile and they are much reduced and brown when mature in the early summer.
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