Adiantum poiretii Wikstr.
Descripción
Rhizomes short- to usually long-creeping, 1.5–3(–4) mm diam.; rhizome scales castaneous, lanceolate, 3–4 X 0.5–0.8 mm, entire to short-ciliate; fronds distant, (10–)20–60(–75) cm long, arching; stipes ca. 1⁄4–1⁄2 the frond length, 7–35 cm X 0.8–2 mm, castaneous to atropurpureous, glabrous except at bases; blades ovate-deltate, (2–)3–4-pinnate proximally, (5–)15–45 X 4–35 cm, gradually tapering to apices; rachises castaneous to atropurpureous, glabrous; pinnae 3–9 pairs, alternate, tapering at apices; pinnulets orbicular to flabellate, 5–8 X 5–10(–15) mm, mostly symmetrical, not articulate, cuneate or truncate at bases, entire or with a few teeth distally, stalk color passing into pinnulet bases and often into veins, non-articulate; veins free, forking, ending in sinuses of sterile pinnulets; indument absent on both surfaces, or glaucous abaxially; idioblasts absent; sori mostly 3–8 per pinnulet, confined to distal margins, yellow farina mixed with sporangia; indusia 1–3 mm long, lunate to reniform or roundreniform, glabrous; 2n=114 (Africa).A
Forma de vida
TerrestreA
Ejemplar revisado
Ags (García R. 2417, HUAA, IEB). BCS (Jones 24558, NY, UC, US). Chih (Correll & Gentry 23045, UC). Chis (Breedlove 22694, DS, NY). Col (Alava & Cook 1705, UC). DF (Mexia 2666, UC). Dgo (Tenorio L. 2146, ENCB, MEXU). Gro (Mexia 9009, B, UC). Gto (Flores 72, ENCB, IEB). Hgo (Knobloch 678, ENCB, US). Jal (Pringle 1867, B, UC, US). Méx (Lyonnet 250, NY). Mich (Bartholomew 2835, CAS, NY). Mor (Lyonnet 1846, MEXU, NY). NL (Hinton 22687, TEX). Oax (Mickel 1170, ENCB, NY, UC). Pue (Marcks & Marcks 747, ENCB). Qro (Herrera 16, ENCB, IEB). SLP (Rzedowski 10060, ENCB). Sin (Gentry 7278, UC, US). Son (Sanders et al. 13481, UC). Tlax (Velázquez s.n., ENCB). Ver (Nee 33077, NY, UC).
Unverified, Doubtful, or Mistaken Reports. Nay (reported by Mickel & Beitel, 1988, and Mickel, 1992, but not verified; Calzada 18618, MEXU, US, determined as this in various herbaria, is A. tricholepis). Tam (reported by Mickel & Beitel, 1988, and Mickel, 1992, but not verified; also reported by Sharp, 1954, from Rancho del Cielo, but not verified). Tres Marías (Ferris 5652, DS, cited by Lenz, 1995, but not verified).A
Unverified, Doubtful, or Mistaken Reports. Nay (reported by Mickel & Beitel, 1988, and Mickel, 1992, but not verified; Calzada 18618, MEXU, US, determined as this in various herbaria, is A. tricholepis). Tam (reported by Mickel & Beitel, 1988, and Mickel, 1992, but not verified; also reported by Sharp, 1954, from Rancho del Cielo, but not verified). Tres Marías (Ferris 5652, DS, cited by Lenz, 1995, but not verified).A
Elevación
800 – 3150 mA
Ecología y Hábitat
Near streams.A
Tipo de vegetación
Bosque de pino-encino, Bosque de encino, Selva alta, Selva mediana, Selva bajaA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
This species and A. andicola are by far the commonest species of Adiantum in Mexico at middle to high elevations, and A. poiretii is especially common in and around the Valley of Mexico. Material from Tristan da Cunha is sometimes considered distinct, in which case all other material is called A. thalictroides Schltdl. Adiantum poiretii is distinguished from A. raddianum by the golden brown scales, usually longer-creeping rhizomes, smaller pinnulets, and yellow farina in the sori. Specimens from northwestern Mexico and Baja California Sur often show a pronounced dimorphism, with the sterile fronds having much larger pinnulets, nearly twice as large as the fertile ones. Given only a sterile frond, it is easy to mistake this species for A. braunii, which may occur in the same general area.A