Diplazium expansum

• Overview
• Interesting Facts
• Common Names
• Description
• Biology
• Taxonomy
• Similar Species
• More Info
• Further Reading
• Notes

Overview

Interesting Facts

Common Names

Description

Genus Diplazium

Plants terrestrial or on rock. Stems creeping , ascending , or erect , stolons absent. Leaves monomorphic , evergreen or dying back in winter. Petiole ca. 1/2 to equaling length of blade , base swollen and persisting as trophopod over winter or not; vascular bundles 2, lateral , lunate in cross section . Blade oblong-lanceolate to deltate, 1-pinnate to 2-pinnate-pinnatifid [simple to 4-pinnate-pinnatifid], gradually reduced distally to pinnatifid apex or apical pinna similar to (conform) adjacent pinnae, herbaceous to papery . Pinnae not articulate to rachis, segment margins entire, crenulate , or serrate; proximal pinnae not reduced, sessile, equilateral or inequilateral ; costae adaxially deeply grooved , grooves continuous with that of rachis; indument abaxially absent or of linear to ovate scales , adaxially absent. Veins free , simple or forked , or basal pairs of adjacent segments anastomosing. Sori single or paired back-to-back on veins, oblong to linear, straight or slightly falcate ; indusia linear, laterally attached, persistent . Spores brownish, usually broadly winged . x = 40, 41.

Species about 400: worldwide.

In a few species outside the flora , rachises and costae bear multicellular hairs like those of Deparia, which differs from Diplazium in having grooves of costae not decurrent onto rachis groove, veins free or anastomosing, sori long or short and costular , and indusia present or absent. Many species of Diplazium are known to reproduce apogamously.[1]

Physical Description

Habitat

Typically found at an altitude of 0 to 4,653 meters (0 to 15,266 feet).[2]

Biology

Reproduction

Duration: Perennial

Taxonomy

Synonyms

Asplenium expansum (Willd.) C. Presl • Asplenium expansum (Willd.) Willd. Ex E. Fourn. • Athyrium Expansum • Athyrium expansum (Willd.) Milde • Athyrium expansum (Willd.) Moore • Panicum koolauense St. John & Hosaka • Panicum oreoboloides (Whitney) Skottsberg • Panicum oreoboloides var. subimbricatum Skottsberg

Notes

Name Status: Accepted Name .

Last scrutiny: 12-Mar-2003

Similar Species

Members of the genus Diplazium

ZipcodeZoo has pages for 16 species, subspecies, varieties, forms, and cultivars in this genus:

D. centripetale (Royal Twinsorus Fern) · D. cristatum (Crested Twinsorus Fern) · D. esculentum (Vegetable Fern) · D. expansum (Great Fern) · D. grandifolium (Largeleaf Twinsorus Fern) · D. hymenodes (Peacock Fern) · D. lherminieri (L'herminier's Twinsorus Fern) · D. lonchophyllum (Lance-Leaf Twin-Sorus Fern) · D. meyenianum (Meyen's Twin-Sorus Fern) · D. molokaiense (Molokai Twin-Sorus Fern) · D. plantaginifolium (Plantainleaf Twinsorus Fern) · D. pycnocarpon (Glade Fern) · D. riedelianum (Riedel's Twinsorus Fern) · D. sandwichianum (Hawai'i Twinsorus Fern) · D. striatum (Striped Twinsorus Fern) · D. unilobum (Singlelobe Twinsorus Fern)

More Info

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Further Reading

• Ferns: British & foreign. The history, organography, classification, and enumeration of the species of garden ferns with a treatise on their cultivation, etc. etc. London, W. H. Allen & Co., Ltd., 1896. url .
• Ferns: British & foreign: the history, organography, classification, and enumeration of the species of garden ferns with a treatise on their cultivation, etc. etc. / by John Smith. London: D. Bogue, 1879. url p. 222.
• Leaflets of western botany. San Fransisco:[J. T. Howell], 1932-1966. url .
• Pteridophyta of Peru. Rolla M. Tryon, Robert G. Stolze; with the collaboration of John T. Mickel, Robbin C. Moran. 27 1991 Chicago, Ill.: Field Museum of Natural History, 1991. url p. 68, p. 75.
• Johnson, D. M. 1986. Trophopods in North American species of Athyrium (Aspleniaceae). Syst. Bot. 11: 26--31.
• Kato, M. 1977. Classification of Athyrium and allied genera of Japan. Bot. Mag. (Tokyo) 90: 23--40.

Notes

Contributors

• Brands, S.J. (comp.) 1989-present. The Taxonomicon. Universal Taxonomic Services, Zwaag, The Netherlands. Accessed January 10, 2012.

Data Sources

Accessed through GBIF Data Portal November 23, 2007:

• GBIF-Spain, CUBA: Herbario de la Academia de Ciencias, La Habana, Cuba: HAC-Pteridophyta
• GBIF-Spain, CUBA:Herbario del Jardín Botánico Nacional, La Habana, Cuba: HAJB-Pteridophyta
• Herbarium of the University of Aarhus, The AAU Herbarium Database
• Herbier de la Guyane, Herbier de la Guyane
• Missouri Botanical Garden, Missouri Botanical Garden

Identifiers

• Biodiversity Heritage Library NamebankID: 2666692
• Catalogue of Life Accepted Name Code: ITS-502091
• Global Biodiversity Information Facility Taxonkey: 13759177
• Globally Unique Identifier: urn:lsid:ipni.org:names:17086820-1
• GRIN Nomen Number: 412409
• Integrated Taxonomic Information System (ITIS) Taxonomic Serial Number (TSN): 502091
• International Plant Names Index (IPNI) ID: 17086820
• MoBot NameID: 26602793
• U.S.D.A. Plant Symbol: DIEX3
• Zipcode Zoo Species Identifier: 34148

Footnotes

1. Masahiro Kato "Diplazium". in Flora of North America Vol. 2. Oxford University Press. Online at EFloras.org. [back]
2. Mean = 591.280 meters (1,939.895 feet), Standard Deviation = 840.280 based on 130 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]

©2004-2012 David Stang. All rights reserved.