Gymnocarpium dryopteris (L.) Newman
  • Phytologist


This taxon is accepted by Cystopteridaceae
Notes: More details could be found in The Plant List v.1.1. Originally in The Plant List v.1.0

General Description

Rhizomes slender, creeping, black, shiny, apex clothed with brown ovate-lanceolate scales. Fronds distant; fertile lamina (15-)20-30(-50) cm; stipe stramineous, 10-22(-35) cm, slender, with sparse scales at base; lamina nearly tripartite, usually 2-pinnate-pinnatifid, pentagonal-ovate or broadly ovate-triangular, 7-15(-20) cm long and wide, thinly herbaceous or submembranous, base broadly cuneate, apex acuminate; basal pair of pinnae nearly as large as other portion of lamina, narrowly triangular, (3.5-)5-9(-12) × 2.5-4(-7) cm, pinnate-pinnatifid, base subtruncate, with stalk (0.8-)1-1.5(-2.5) cm, portion of rachis between basal pinnae and central lamina ca. 3 cm; pinnules 5 or 6 pairs, oblong-lanceolate, 1.5-2(-4) × 0.5-2 cm, base rounded-cuneate, sessile, apex acute or acuminate, opposite or subopposite, spreading; largest pinnules with 6-10 pairs of segments, segments approximate, oblong to narrowly ovate, ca. 4 mm, lobed to narrow costular wing, entire to shallowly lobed at margin, rounded-obtuse at apex; second basal pair of pinnae 1.5-4 cm apart from basal pair, sometimes shortly stalked, upper pinnae sessile; veins pinnate in segment, simple, oblique, visible abaxially; rachis and costae slender, eglandular. Sori small, exindusiate, orbicular, abaxial on veins. Spore wall surface rugate, foveolate. 2n = 160.

American Gymnocarpium dryopteris is an allotetraploid species that arose following hybridization and polyploidization between G. disjunctum (Ruprecht) Ching and G. appalachianum Pryer & Haufler.

Sarvela noted that a specimen of Gymnocarpium dryopteris from Japan was indusiate; the indusia were reniform, ca. 0.5 mm in diam., hyaline, glabrate, erose at margin. It may be an example of atavism.

"Petiole 10–30 cm; blade yellow-green, scaleless, deltoid-pentagonal, to 18 × 25 cm, bipinnate-pinnatifid to tripinnate-pinnatifid, glabrous or occasionally slightly glandular especially along the rachis, pinnae several pairs, opposite, the members of the lowest pair deltoid and each nearly as long as the rest of the blade, with a petiolule to 2.5 cm long, distinctly asymmetrical, the lowest basiscopic segment evidently the largest, mostly a third as long as the main rachis or longer; ultimate segments oblong, 8–18 mm, obtuse, the margins crenate to subpinnatifid, not recurved; veins 2–6 pairs, mostly simple; 2n=160 (ours). Cool woods and talus-slopes; circumboreal, s. to Va., N.C., O., Ill., Io., and Ariz. A vegetatively reproducing hybrid with the next is G. ×heterosporum W. H. Wagner."

  Bibliography

  • 1 "Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp."
  • 2 Phytologist

 Information From

Cystopteridaceae
World Flora Online Data. 2017.
  • A CC0 1.0 Universal (CC0 1.0).
Flora Of China @ efloras.org
http://www.efloras.org/flora_page.aspx?flora_id=2
'Flora of China @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=2 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  • B All Rights Reserved
New York Botanical Garden
https://www.nybg.org
Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
  • C Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
World Flora Online consortium
http://about.worldfloraonline.org/
World Flora Online Data. 2017.
  • D CC0 1.0 Universal (CC0 1.0).