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Gymnocarpium disjunctum

(Pacific Oak Fern)

Overview

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Interesting Facts

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Common Names

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Common Names in English:

Pacific Oak Fern, Pacific Oakfern, Western 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 disjunctum

Stems 1--3 mm diam.; scales 2--4 mm. Fertile leaves usually 20--68 cm. Petiole 12--44 cm with sparse glandular hairs distally; scales 2--6 mm. Blade broadly deltate, 3-pinnate-pinnatifid, 8--24 cm, lax and delicate, abaxial surface and rachis glabrous or with sparse glandular hairs, adaxial surface glabrous. Pinna apex acuminate. Proximal pinnae 5--18 cm, ± perpendicular to rachis, with basiscopic pinnules ± perpendicular to costa; basal basiscopic pinnule sessile, pinnate-pinnatifid (with basal pinnulets, and sometimes 2 adjacent pinnulets, separate), basal basiscopic pinnulet usually longer (sometimes equaling or shorter) than adjacent pinnulet; 2d basal basiscopic pinnule sessile with basal basiscopic pinnulet usually longer than or equaling adjacent pinnulet; basal acroscopic pinnule sessile, with basal basiscopic pinnulet usually longer than or equaling adjacent pinnulet. Pinnae of 2d pair usually sessile with basal basiscopic pinnule longer than or equaling adjacent pinnule and markedly longer than basal acroscopic pinnule; basal acroscopic pinnule distinctly shorter than adjacent pinnule or rarely absent, apex often crenulate , obtuse . Pinnae of 3d pair usually sessile with basal basiscopic pinnule longer than or equaling adjacent pinnule and longer than basal acroscopic pinnule; basal acroscopic pinnule shorter than adjacent pinnule. Ultimate segments of proximal pinnae oblong , crenate to slightly lobed , apex crenulate, acute. Spores 27--31 µm. 2 n = 80. [source]

Habitat

Shaded, rocky slopes and ravines , mixed coniferous woods , moist stream and creek banks; of conservation concern; 0--2400 m [2].

Typically found at an altitude of 0 to 2,062 meters (0 to 6,765 feet).[3]

Taxonomy

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Synonyms

Distr. Crypt. Vasc. Ross. • Dryopteris disjuncta (Rupr.) Morton • Dryopteris disjuncta (Ruprecht) C. V. Morton • G. dryopteris var. disjunctum (Ruprecht) Ching • Gymnocarpium dryopteris (Linnaeus) Newman Disjunctum (Ruprecht) Sarvela • Gymnocarpium dryopteris disjunctum (Rupr.) Sarvela • Gymnocarpium dryopteris var. disjunctum (Rupr.) Ching • Polypodium Disjunctum • Polypodium dryopteris Linnaeus Var. disjunctum Ruprecht

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 November 24, 2007:

Identifiers

Footnotes

  1. Kathleen M. Pryer "Gymnocarpium". in Flora of North America Vol. 2. Oxford University Press. Online at EFloras.org. [back]
  2. "Gymnocarpium disjunctum". in Flora of North America Vol. 2. Oxford University Press. Online at EFloras.org. [back]
  3. Mean = 961.550 meters (3,154.692 feet), Standard Deviation = 643.300 based on 112 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 7/15/2012