Nephrolepis cordifolia (L.) C. Presl
Descripción
Rhizomes erect, stoloniferous, often with tubers; rhizome scales spreading, concolorous, linear, orange to tan, 1–3 mm long, margins entire; stipes 9–18 cm long, ca. 1⁄6 the frond length, light brown, grooved, often persistently fibrillose-scaly; blades firm, herbaceous, linear-elliptic, 30–80 X 5–7 cm; rachises light brown, fibrillose-scaly, scales bicolorous (pale with dark point of attachment); pinnae narrowly deltate, apices acute, bases unequal, lobed with basiscopic lobe rounded to cordate, not overlapping rachises, acroscopic lobe larger, auriculate, slightly overlapping the rachis, margins crenate; veins indistinct, glabrous; hydathodes often lime-dotted on adaxial blade surfaces; indusia tan, reniform to lunate, 1–1.3 mm in longest dimension, mostly opening toward pinna apices, attached along broad, shallow sinuses, opening toward pinna apices; 2n=82 (India).A
Forma de vida
TerrestreA
Ejemplar revisado
Chis (Breedlove 16064, 23670, DS). DF (Fernández N. 2, ENCB, a cultivar; Montes R. 7, UAMIZ). Méx (Tejero-Díez 2213, IZTA). Oax (Schultes 756, US). Pue (Knobloch 2165, US; Rzedowski 29996, ENCB, NY). Ver (Pringle 7995, MO; Provance 3339, UC; Purpus 253, BM; Valdivia Q. 1972, XAL; Ventura A. 884, ENCB, NY).
Unverified, Doubtful, or Mistaken Reports. Tab (reported by Magaña, 1992, probably based on a misidentification).
A
Unverified, Doubtful, or Mistaken Reports. Tab (reported by Magaña, 1992, probably based on a misidentification).
A
Elevación
750 – 1500(– 2200) mA
Tipo de vegetación
Bosque de neblina/mesófiloA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
En peligro de extinción (P)C
Discusión taxonómica
This species is probably not native in Mexico (or Central America either), but is relatively recently introduced and naturalized in a few localities. The two Chiapas collections cited are from cultivated plants in gardens in and around San Cristóbal Las Casas, and the two specimens from Distrito Federal are also from cultivated plants in or near Mexico City. Arsène 6690 (MEXU), cited by Díaz-Barriga and Palacios-Rios (1992) from Michoacán, has not been found, but is apparently of garden origin (Palacios-Rios, pers. comm.); they cited this same collection, from the same herbarium, as N. pectinata. Rzedowski 29996 is from very disturbed oak forests. Most of the specimens in herbaria that have been identified as N. cordifolia have proven to be other species, particularly N. pectinata and N. pendula. See N. pendula, N. exaltata, and key for differences and discussion.
Mexia 9274 has been determined as this species in some herbaria (e.g., NY), by Nauman, 1979, but apparently he later changed either his mind or species concepts, as other specimens of the same gathering (e.g., in UC, 1984) are determined by him as N. pectinata. All specimens of this number appear to be the same taxon, and we concur with this more recent determination.
Nephrolepis cordifolia ‘Duffii’, a form with small orbicular pinnae, is sometimes cultivated in Mexico, but it is always vegetative and not likely escaped. However, a specimen has been seen from Tabasco, Acosta 42 (UAMIZ), “de abundancia regular en selva alta perennifolia en el cerro del madrigal.” This taxon was cited and illustrated from Tabasco by Magaña (1992) as Jamesonia alstonii!A
Mexia 9274 has been determined as this species in some herbaria (e.g., NY), by Nauman, 1979, but apparently he later changed either his mind or species concepts, as other specimens of the same gathering (e.g., in UC, 1984) are determined by him as N. pectinata. All specimens of this number appear to be the same taxon, and we concur with this more recent determination.
Nephrolepis cordifolia ‘Duffii’, a form with small orbicular pinnae, is sometimes cultivated in Mexico, but it is always vegetative and not likely escaped. However, a specimen has been seen from Tabasco, Acosta 42 (UAMIZ), “de abundancia regular en selva alta perennifolia en el cerro del madrigal.” This taxon was cited and illustrated from Tabasco by Magaña (1992) as Jamesonia alstonii!A