The American ferns of the group of Dryopteris opposita contained in the U.S. National Museum
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The American ferns of the group of Dryopteris opposita contained in the U.S. National Museum by Carl Frederik Albert Christensen

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Published by Smithsonian Institution in Washington .
Written in English

Subjects:

  • Dryopteris.,
  • Ferns -- America.

Book details:

Edition Notes

Reprint. Originally published July 12, 1909.

Statementby Carl Christensen.
SeriesSmithsonian miscellaneous collections -- v. 52, art. 25, Publication -- 1867, Publication (Smithsonian Institution) -- 1867.
ContributionsUnited States National Museum.
The Physical Object
Paginationp. 365-396 ;
Number of Pages396
ID Numbers
Open LibraryOL22941969M
LC Control Number16012774

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The American ferns of the group of Dryopteris opposita contained in the U.S. National Museum /Author: Carl Christensen. *Dryopteris nova brasiliensis.-Fedde: Repertorium sp. nov. 6: The American ferns of the group of Dryopteris opposita contained in the U. S. National Museum.-Smithsonian Misc. Collections (Quarterly issue) *On Stigmatopteris, a new genus of ferns, with a review of its species.-Bot. Tids. , 15 f. 8. The American ferns of the group Dryopteris opposita contained in the U. S. National Museum. Smith-son. Misc. Coll. 12 J1 9. Ueber einige Farne in O. Swartz' Herbarium. Arkiv Bot. pl. f. 22 F , On some species of ferns collected by Dr. Carl Skotts-berg in temperate South America. Arkiv Bot. American Ferns of the Group of Dryopteris opposita Contained in the United States National Museum. Smithsonian Miscellaneous Collections, Vol. 52, Smithsonian Institution, Washington, DC. PB. LC Christensen, Carl Frederik Albert. Asiatic Pteridophyta Collected by Joseph F. Rock

This a 4-pinnate Dryopteris with 2m long leaves. It is similar to D. subarborea but the cutting of the segments is different. Any suggestions to as the identification of this species are appreciated. The sori (group of spores) are found on the underside of the leaf. They are circular and arranged mostly in a row on both sides of the mid-vein on a leaflet lobe. Not all leaves have spores and the lowest branches on a fertile frond typically have no spores either. Start studying Ferns. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The fern sporophyte is the typical fern plant and is diploid. Leaflets of the fronds can bear sporangia which are found in clusters called sori. The sori undergo meiosis and produce haploid spores.

  The thirteen species of Dryopteris in North America have long been suspected of having undergone a complicated history of reticulate evolution via allopolyploid hybridization. Various explanations for the origins of the allopolyploid taxa have been suggested, and though most lines of evidence have supported the so-called “semicristata” hypothesis, contention over the group’s history Cited by: Abstract. Stem erect, decumbent or to very long-creeping, stout to slender, with a dictyostele, usually indurated, bearing scales; leaves ca. 10 cm to 5 m long, entire or usually pinnate, circinate in the bud, petiole without stipules; sporangia borne in roundish to elongate abaxial sori or rarely also on the leaf-tissue, indusiate, the indusium usually reniform, or exindusiate, mostly rather. Hawaiian ferns and lycophytes represent a relatively large percentage of the endemic flora with approximately 74% of the native fern and lycophyte species considered endemic. In addition, at least. National Emergency Library. Top American Libraries Canadian Libraries Universal Library Community Texts Project Gutenberg Biodiversity Heritage Library Children's Library. Open Library. Featured Metropolitan Museum. Top NASA Images Solar System Collection Ames Research Center. Brooklyn Museum.