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Gymnocarpium jessoense

(Asian Oakfern)

Interesting Facts

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Common Names

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Common Names in English:

Asian Oakfern, Northern Oak Fern

Description

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Genus Gymnocarpium

Plants terrestrial . Stems long-creeping, stolons absent. Leaves monomorphic , dying back in winter. Petiole ca. 1.5--3 times length of blade , base not swollen; vascular bundles 2, lateral , ± oblong in cross section . Blade broadly deltate, ternate , or ovate , 2--3-pinnate-pinnatifid, reduced distally to pinnatifid apex, herbaceous. Pinnae weakly articulate to rachis but persistent , segment margins entire to crenate ; proximal pinnae longest, petiolulate , usually ± inequilateral with pinnules on basiscopic side longer than those on acroscopic side; costae adaxially grooved , grooves not continuous from rachis to costae; indument lacking or of minute (0.1 mm) glands abaxially and sometimes along costae adaxially. Veins free , simple or forked . Sori in 1 row between midrib and margin, ± round ; indusia absent. Spores brownish, rugose . x = 40.

Species 8: north temperate regions , North America, Eurasia .[1]

Physical Description

Species Gymnocarpium jessoense

Dryopteris jessoensis Koidzumi, Bot. Mag. (Tokyo) 38: 104. 1924; Aspidium dryopteris (Linnaeus) Baumgarten var. longulum H. Christ; Gymnocarpium longulum (H. Christ) Kitagawa; G. robertianum (Hoffman) Newman subsp. longulum (H. Christ) Toyokuni [source]

Habit: Forb/herb

Habitat

Typically found at an altitude of 0 to 3,224 meters (0 to 10,577 feet).[2]

Biology

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Reproduction

Duration: Perennial

Taxonomy

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Notes

Name Status: Accepted Name .

Last scrutiny: 15-Mar-2000

Similar Species

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Members of the genus Gymnocarpium

ZipcodeZoo has pages for 13 species, subspecies, varieties, forms, and cultivars in this genus:

G. achriosporum (Oakfern) · G. appalachianum (Appalachian Oak Fern) · G. disjunctum (Pacific Oak Fern) · G. dryopteris (Northern Oak Fern) · G. heterosporum (Blackspore Oakfern) · G. intermedium (Intermediate Oakfern) · G. jessoense (Asian Oakfern) · G. jessoense parvulum (Asian Oakfern) · G. jessoense subsp. parvulum (Asian Oakfern) · G. robertianum (Limestone Oak Fern) · G. × achriosporum (Oakfern) · G. x heterosporum (Black-Spore Oak Fern) · G. × intermedium (Intermediate Oakfern)

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal February 28, 2008:

Identifiers

Footnotes

  1. Kathleen M. Pryer "Gymnocarpium". in Flora of North America Vol. 2. Oxford University Press. Online at EFloras.org. [back]
  2. Mean = 598.400 meters (1,963.255 feet), Standard Deviation = 937.640 based on 10 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 7/15/2012