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Osmundaceae is the only fern family of the order Osmundales; an order in the class Polypodiopsida or in some classifications the only order in the class Osmundopsida. Cinnamon Fern ( Osmundastrum cinnamomeum) is a species of Eusporangiate Fern in the family Osmundaceae. Osmunda is a Genus of primarily temperate-zone Ferns of family Osmundaceae. The Fern genus Todea is known from only two living species Todea barbara L A fern is any one of a group of about 20000 Species of Plants classified in the phylum or division Pteridophyta, also known as Filicophyta The Pteridopsida is a class of Plants in the Division Pteridophyta that includes all the Leptosporangiate ferns In the recent 2006 classification by This is an ancient (known from the Upper Permian) and fairly isolated group that is often known as the "flowering ferns" because of the striking aspect of the ripe sporangia in Osmunda and Osmundastrum. The Permian is a geologic period and system that extends from 299 A sporangium (pl sporangia) is a Plant or fungal structure producing and containing Spores Sporangia occur in angiosperms, In these genera the sporangia are borne naked on non-laminar pinnules, while Todea and Leptopteris bear sporangia naked on laminar pinnules. Ferns in this family are larger than most other ferns.
Ferns of this family form heavy rootstocks with thick mats of wiry roots. Many species form short trunks; in the case of the genus Todea, they are sometimes considered as tree ferns because of the trunk, although it is relatively short. The Fern genus Todea is known from only two living species Todea barbara L The order Cyatheales is a Taxonomic division of the Fern subclass Cyatheatae, which includes the tree ferns.
The leaf tissue ranges from very coarse, almost leathery in the case of the Cinnamon fern (Osmundastrum cinnamomeum), to delicate and translucent, as in the case of the genus Leptopteris. In Botany, a leaf is an above-ground Plant organ specialized for Photosynthesis. Cinnamon Fern ( Osmundastrum cinnamomeum) is a species of Eusporangiate Fern in the family Osmundaceae.
Recent research on this family has significantly changed our understanding of the relationships of its species. The most striking finding is that O. cinnamomeum, despite its apparent similarity to Osmunda claytoniana, is actually the most anciently-derived species of the family, and so is a sister clade to the clade that comprises Osmunda, Todea, and Leptopteris (Jud et al. Osmunda claytoniana ( Interrupted Fern) is a Fern native to eastern North America and eastern Asia. 2008), (Metzgar et al. 2008).
References
- 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, 33(1): pp. 31–36.
- Jud, Nathan, Gar W. Rothwell, and Ruth A. Stockey (2008). "Todea from the Lower Cretaceous of western North America: implications for the phylogeny, systematics, and evolution of modern Osmundaceae. " American Journal of Botany, 95:330-339.
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