Polypodium hartwegianum Hook.

  • Authority

    Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.

  • Family

    Polypodiaceae

  • Scientific Name

    Polypodium hartwegianum Hook.

  • Description

    Species Description - Rhizomes creeping, 4–6 mm diam.; rhizome scales widely spreading, dark reddish brown, 4–6 x 1 mm, margins paler, narrow, tips linear to uniseriate, ovate-lanceolate to lanceolateattenuatelanceolateattenuate, with an occasional marginal hair; fronds 15–60(–79) cm long, 3–8 mm distant; stipes 1/6–1/3 the frond length, castaneous, glabrous; rachises with dense hairs 0.3 mm long adaxially, scattered hairs abaxially; blades 1-pinnate, apices pinnatifid; pinnae 22–49 pairs, sessile, acuminate, linear-oblong, 30–50 x 6–10 mm, only slightly reduced proximally, the basal pinnae at least 1/2 as long as the longest pinnae; hairs sparse abaxially, scattered to abundant on adaxial surfaces, 0.1–0.3 mm, and along margins, 0.3–0.5 mm; margins slightly undulate; veins free; sori distinctly elongate-oblong; sporangia with sharp-pointed setae less than 0.1 mm long.

    Distribution and Ecology - Epiphytic, rarely terrestrial or epipetric, in cool, wet pine-oak forests; 1850–3100 m. Mexico; Guat, Hond, Salv.

  • Discussion

    Type. Mexico. [Hidalgo:] “Monte Sumate” [Zumate], 9500’, Hartweg [415] (K-2 sheets!, frag. & drawing NY!; isotypes BM!, G photo US!, L photos NY! & UC!, P!).

    Polypodium ellipsoideum Fe´e, Me´m. Foug. 7: 57, t. 21, f. 1. 1857. Syntypes. Mexico. Popocate´petl, Schaffner 270 (P!); “San Angel,” Schaffner 211 (presumably P, not found; isosyntype K!). Polypodium pubescens Fe´e, Me´m. Foug. 8: 87. 1857, hom. illeg., non L., 1759. P. fournieri C. Chr., Index Filic. 528. 1906. Type. Mexico. Veracruz: Huatusco, a` Dos Puentes, Schaffner 181, 1854 (P?).

    Unverified, Doubtful, or Mistaken Reports. NL (Favela 33, UNL, cited by Arregui´n-Sa´nchez & Aguirre-Clavera´n, 1985, but not verified). This is the most common species of Polypodium at higher elevations. It is distinct by the elongate sori and pilose blades. Polypodium liebmannii is similar but densely hairy on the abaxial surfaces, and the fronds are larger (60–115 cm).

  • Distribution

    Mexico North America|