Polystichum acutidens Christ
  • Bull. Acad. Int. Géogr. Bot.


Cite taxon page as 'WFO (2022): Polystichum acutidens Christ. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0001115322. Accessed on: 05 Jul 2022'

General Information

Plants evergreen. Rhizome erect, up to 10 cm, together with remnant old stipe base up to 3 cm in diam., rhizome apex and stipe base densely scaly; scales brown or dark brown, ovate or ovate-lanceolate, up to 8 × 3 mm, thickly membranous, entire. Fronds 25-100 cm; stipe stramineous, 5-40 cm, 1-2 mm in diam. at base, sparsely scaly upward, a few distal stipe scales similar to basal stipe scales; more distal stipe scales gradually narrower toward rachis apex, brown or dark brown, lanceolate or narrowly subulate, mostly appressed, membranous, with sparse long teeth. Lamina 1-pinnate, green or grayish green when dry, adaxially darker, lanceolate, 18-65 × 2.5-12 cm, slightly contracted or not at base, acuminate; rachis stramineous, without proliferous bulbils, sparsely scaly abaxially; scales often appressed, brown or dark brown, lanceolate, linear, or narrowly subulate, sparsely toothed, membranous. Pinnae 25-45 pairs, sessile, alternate or opposite, lower pairs more remote and sometimes angled acroscopically, upper pairs contiguous, falcate-lanceolate, 1-6 cm × 3-10 mm at middle, apices acuminate, often spinulose, bases obviously asymmetrical, acroscopic base with deltoid auricles, proximal margins of auricles truncate or slightly curved outward, parallel to rachis, basal basiscopic margins narrowly cuneate, straight or slightly recurved, both acroscopic and basiscopic margins toothed, tips of teeth often ± recurved and shortly or long spinulose; adaxially glabrous, abaxially sparsely covered with narrowly lanceolate light brown or brown microscales; frond texture papery or thinly papery; venation pinnate, visible or distinct abaxially, indistinct adaxially; lateral veins pinnate above midrib from base to apex, dichotomous or simple, simple or dichotomous below midrib. Sori small, terminal on shorter veinlets, in 1 row on each side of midrib, medial or nearly medial, veinlets of lower part below midrib often without sori; indusia present, dark brown, small, subentire, caducous. Spores reniform in equatorial view, narrowly elliptic in polar view; perispore sculpturing plicate with numerous granules.

  • Provided by: [B].Flora of China @ efloras.org
    • Source: [
    • 1
    • ]. 

     Information From

    Dryopteridaceae
    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 Missouri Botanical Garden
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • C CC0 1.0 Universal (CC0 1.0).