Polystichum acrostichoides (Michx.) Schott
  • Gen. Fil.
  • Christmas fern, polystic faux-acrostic

Cite taxon page as 'WFO (2022): Polystichum acrostichoides (Michx.) Schott. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0001109261. Accessed on: 03 Jul 2022'

General Information

Stems erect. Leaves dimorphic (only in this species); fertile pinnae distal, much contracted; sterile leaves arching, 3--8 dm; bulblets absent. Petiole 1/4--1/3 length of leaf, densely scaly; scales light brown, diminishing in size distally. Blade linear-lanceolate, 1-pinnate; base narrowed. Pinnae oblong to falcate, not overlapping, in 1 plane, 2--6 cm; base oblique, acroscopic auricles well developed; margins serrulate-spiny with teeth ascending; apex acute or blunt with subapical and apical teeth same size; microscales filiform, lacking projections, dense, on abaxial surface only. Sori confluent, completely covering abaxial surface of pinnae (only in this species); indusia entire. Spores light brown. 2 n = 82.

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

    "Rhizome short-creeping; lvs 3–7.5 dm, the green petiole a fourth to two-fifths as long as the blade; blade pinnate, 5–12 cm wide, lance- linear, acuminate, not reduced at base; pinnae alternate, 20–35 pairs, linear-oblong, acute, sharply auricled at the upper base, dark green and scaleless above, paler and with hair-like scales beneath; fertile upper pinnae abruptly smaller; sori commonly in 2 rows on each side of the midrib; indusium thick, entire, blackish when dry; 2n=82. Woods and open thickets; N.S. to Wis., s. to Fla., Tex., and Mex. A hybrid with no. 2 [Polystichum lonchitis (L.) Roth] is P. ×hagenahii Cody."

  • Provided by: [C].New York Botanical Garden
    • Source: [
    • 2
    • ]. 

    Other Local Names

    Christmas fern, polystic faux-acrostic


     Information From

    World Flora Online Data. 2017.
    • A CC0 1.0 Universal (CC0 1.0).
    Flora of North America @ efloras.org
    'Flora of North America @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=1 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • B Flora of North America Association
    New York Botanical Garden
    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
    World Flora Online Data. 2018.
    • D CC0 1.0 Universal (CC0 1.0).