Monographs Details: Woodsia mexicana Fée
Authority: Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.
Family:Woodsiaceae
Scientific Name:Woodsia mexicana Fée
Description:Species Description - Rhizomes horizontal to ascending, compact, 2–3 mm diam.; rhizome scales bicolorous orange-tan with black central stripe, linear-lanceolate, entire; fronds 6–18 cm, clumped; stipes 1/6–1/3 the frond length, stramineous, with glandular hairs; blades pinnate-pinnatifid to bipinnate, 2.5–5.5 cm wide, lanceolate to narrowly deltate, basal pinna pair slightly reduced; pinnae 5–10 pairs, oblong, obtuse, lobes coarsely dentate, the teeth with hair extensions, indument of glandular hairs; indusial lobes as platelike at bases, filamentous at tips, conspicuously surpassing the sporangia; spores 42–53 µm.

Discussion:

Woodsia pusilla E. Fourn. var. mexicana (Fe´e) T. M. C. Taylor, Amer. Fern J. 37: 86. 1947. Type. Mexico. Distrito Federal: prope San Angel, Schaffner 306, in 1855 (RB). Woodsia pusilla E. Fourn., Bull. Soc. Bot. France 27: 329. 1880. Type. Mexico. San Luis Potosi´: San Miguelito, Schaffner 68, in 1877 (P!).

Unverified, Doubtful, or Mistaken Reports. Ags (Siqueiros 4344, Gonza´lez-Adame 594, both HUAA, cited by Siqueiros-Delgado & Gonza´lez-Adame, 2004, but not verified and doubtful). Chih (reported by Knobloch & Correll, 1962, but figures and specimens are W. phillipsii). Gto (Rzedowski 42021, IEB, cited by Di´az-Barriga & Palacios-Rios, 1992, but not verified and very doubtful). Jal (Villa 005, CHAPA, NY, cited by Mickel, 1992, but the plant is W. phillipsii). Ver (Seaton 280 F, GH, cited by Palacios-Rios, 1992, but specimens are W. mollis vel aff.).

Woodsia mexicana is thought to be derived from past hybridization between W. phillipsii and W. plummerae. The plants are relatively small but have large segments/lobes, pale stipes, and are heavily glandular. Some teeth have crustose projections, and the indusial segments are united proximally, filamentous distally. The species has a distinct range and little overlap with its presumed parents.