Asplenium scolopendrium var. americanum (Fernald) Kartesz & Gandhi
  • Phytologia 70: 196 (1991)
  • American hart's-tongue

Cite taxon page as 'WFO (2023): Asplenium scolopendrium var. americanum (Fernald) Kartesz & Gandhi. Published on the Internet; Accessed on: 29 Mar 2023'

General Information

Roots not proliferous. Stems erect, unbranched; scales brown, lanceolate, 3--6 × 1--1.5 mm, margins entire. Leaves monomorphic. Petiole brown to straw-colored, dull, 3--10 cm, 1/8--1/4 length of blade; indument of brown, narrowly lanceolate scales. Blade linear, simple, 8--35 × 2--4.5 cm, thick, papery, nearly glabrous; base cordate; margins entire; apex acuminate, not rooting. Rachis brown proximally, straw-colored distally, dull, glabrous. Veins free, obscure. Sori numerous, perpendicular to rachis, or nearly so, usually restricted to distal 1/2 of blade. Spores 64 per sporangium. Usually 2 n = 144.

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

    Roots coarse, fibrous, not proliferous; rhizomes erect; rhizome scales blackish to dark brown, clathrate, 1.5–6 x 1–1.5 mm, entire or weakly short-ciliate; fronds clumped, 9–65 cm long; stipes brownish to stramineous, dull, 1.5–20 cm x 1.5–5 mm, ca. 1⁄5– 1⁄3 of frond length, with dense, linear to lanceolate, tan, ultimately clathrate scales, not alate; blades thick-herbaceous to subcoriaceous, simple, 7–22(–35) x 1.8–5 cm, oblong, entire to slightly undulate, bases cordate to subcordate or with two downward-directed lobes, apices acute, proliferous buds absent; rachises brownish at bases, light green to stramineous distally (lighter than the blades), dull, with sparse to dense scales 1–2.5 x 0.1–0.2 mm, not winged; pinnae absent; veins simple or 1- or 2-forked, obscure, parallel for most of their length, tips evident adaxially; indument abaxially of scattered, linear scales to 0.5–1 x 0.1 mm, also with sparse catenate hairs to 0.5 mm long; sori paired, facing each other on adjacent veins, usually confined to distal 1⁄2–2⁄3 of blades; indusia (2–)6–15 x 0.3–0.7 mm, margins entire or repand; spores reniform; 2n=144 (Can, USA, Chis, see Viane & Reichstein, 1991: 163).

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


    Epipetric on moist calcareous rocks (dolomitic limestone) in sinkholes, at cave entrances, and on cool, moist talus, and on limestone cliffs, occasionally epiphytic on old oaks, in deep shade; 2100–2200 m. Can (Ont), USA (spotty in Ala, Mich, NY, Tenn); Mexico; Hisp (Haiti).

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

    Other Local Names

    American hart's-tongue

     Information From

    World Flora Online Data. 2021.
    • A CC0 1.0 Universal (CC0 1.0).
    Flora of North America @
    'Flora of North America @ eFloras (2008). Published on the Internet [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • B Flora of North America Association
    Memoirs of the 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. 2017.
    • D CC0 1.0 Universal (CC0 1.0).