Dennstaedtia distenta

Dennstaedtia distenta

Content

Altitude

1200–2300 mA
A. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88

Description

Rhizomes long-creeping, unbranched, ca. 5 mm diam., bearing brown hairs; fronds 2–4 m long, clumped; stipes brown proximally, stramineous distally, glabrous, each with one bud at the base; blades deltate, 3–4-pinnate-pinnatifid; rachises stramineous; pinnae opposite or subopposite, sessile, with 1 pair of reduced pinnules at pinna bases; sterile vein tips not enlarged, ending well before the margins; abaxial surfaces with hairs 0.8–1 mm long, somewhat tortuous hairs on axes grading to clavate hairs 0.1 mm on laminae; vertical wings absent adaxially; indusia shallow, 0.1–0.3 mm deep, 0.5–0.8 mm wide; 2n=ca. 88 (Chis).B
B. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88

Discussion

Dennstaedtia distenta is distinct from D. cicutaria by having sessile, nearly opposite, unreduced, proximal pinnae not reduced at pinna base, stramineous major axes, and monomorphic hairs on axes.
“Dennstaedtia mexicana Rosenstock” has never been effectively published but has been used for this species by some authors, e.g., Matuda, Anales Inst. Biol. Univ. Nac. México 27: 66. 1956. See note by Morton, Amer. Fern J. 48: 124. 1958.
C
C. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88

Distribution

Caribe presentD, Costa Rica presentD, El Salvador presentD, Guatemala presentD, México (Country) native and not endemicD, Panama presentD
D. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88

Habitat & Ecology

Wooded banks, often near streams.E
E. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88

Specimen

Chih (Nesom & Vorobik 5598, MEXU, TEX). Chis (Breedlove 34619, NY). Dgo (Roberts & Keil 10239, NY). Gro (Hinton 14046, NY). Hgo (Rzedowski 32478, ENCB). Jal (Iltis & Guzmán M. 3174a, NY). Méx (Hinton 3748, NY). Mich (Rzedowski 42879, IEB). Mor (Hinton 17065, NY). Oax (Mickel 5011, NY). Pue (Herrera & Riba 3, MEXU). Qro (Rzedowski 46561, IEB). Sin (Gentry 7300, NY). Son (Gentry 1395, UC, US). Ver (Ventura A. 5186, NY).F
F. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88

Synonymy

Dennstaedtia distenta (Kunze) T.Moore, Index Fil. (T.Moore) 306. 1861
  • ≡Dicksonia distenta Kunze, Analecta Pteridogr.: 39. 1837