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Osmunda spectabilis

Species of fern

Summary

Species of fern

Osmunda spectabilis, known as American royal fern, is a species of fern native to a large area of the New World, from the eastern half of Canada and the United States to Argentina.

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.

|Osmunda spectabilis close up.jpg|Closeup of sterile frond |Osmunda regalis var spectabilis CR-060218-1324.jpg|Mature plant

Distribution and habitat

American royal fern is most commonly found growing in wetter soils such as those found in wet forests, bogs, and along streams and lakes.

Taxonomy

{{clade	label1=Osmunda	1={{clade	label1=subg. Claytosmunda	1=Claytosmunda claytoniana	2={{Clade	label1=subg. Plenasium	1={{clade	1=Plenasium javanicum	2={{clade	1=Plenasium banksiifolium	2=Plenasium vachellii	label2=subg. Osmunda	2={{clade	1=Osmunda regalis	2={{clade	1=Osmunda spectabilis	2={{clade	1=Osmunda japonica	2=Osmunda lancea

Osmunda spectabilis was formerly considered to be a variety of Osmunda regalis (Osmunda regalis var. spectabilis). Another variety, Osmunda spectabilis var. brasiliensis, (formerly Osmunda regalis var. brasiliensis) also exists in tropical regions of Central and South America, but it is only recognized by some authors.

Osmunda angustifolia, Osmunda bromeliifolia, and all extinct Osmunda species are missing from this cladogram. The classification is based on the genetic analysis presented in "The Paraphyly of Osmunda is Confirmed by Phylogenetic Analyses of Seven Plastid Loci."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 https://sites.duke.edu/pryerlab/files/2017/12/metzgar-et-al-osmunda-2008.original.pdf

References

(2021). "''Osmunda spectabilis''".
Fewless, Gary. "Royal Fern". Cofrin Center for Biodiversity, University of Wisconsin, Green Bay.
"Royal Fern". Connecticut Botanical Society.
"''Osmunda regalis'' var. ''spectabilis''". Maryland Biodiversity Project.
"''Osmunda spectabilis'' Willd.". [[Royal Botanic Gardens, Kew]].

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

osmundales ferns-of-the-americas plants-described-in-1810

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