Adiantum jordanii Müll. Hal.
Descripción
Rhizomes short-creeping, 2–3 mm diam.; rhizome scales castaneous, 2–3.5 X 0.4–0.6 mm, margins entire; fronds clumped, 18–35(–45) cm, arching or pendent; stipes castaneous, lustrous, 9–20 X 1–1.5 mm, glabrous except at bases, not glaucous; blades ovate-lanceolate, 2–3-pinnate proximally, gradually tapered distally, 10–24 X 8–10 cm; rachises castaneous, glabrous; pinnae 4–6 compound pairs, alternate, proximal pinnae 1–2-pinnate; pinnulets flabellate to orbicular, usually broader than long, bases truncate or broadly cuneate, distal margins rounded, slightly incised, sterile margins serrulate, stalks 1–4 mm, with dark color ending ± abruptly at pinnulet bases, non-articulate; veins free, forking, ending in marginal teeth; indument absent on both sides of blades; idioblasts absent; sori 2–5 per pinnulet, confined to distal margins; indusia 3–8(–10) mm long, oblong to linear, glabrous; 2n=60 (USA).A
Forma de vida
TerrestreA
Ejemplar revisado
BCN (Bell 1378, CAS, DS, MEXU; Fisher et al. 2200, ARIZ, ENCB; Mason et al. 3451, ARIZ, ENCB; Moran 26389, MEXU, MO; Shreve 6815, MO, US; Wiggins 4225, CAS, DS, US, 5150, DS, US, 7541, DS, NY, UC, US). BCS (Epling & Robison s.n., 27 Mar 1940, DS; Epling & Stewart s.n., 11 Apr 1936, DS).A
Elevación
50 – 500 mA
Ecología y Hábitat
Moist ground in shade, on rocky banks, north slopes in chaparral, in damp shady gullies.A
Tipo de vegetación
Matorral de otro tipoA
Tipo de vegetación (notas)
Chaparral.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
This species is characterized by flabellate pinnulets with veins ending in teeth, 2–3(–5) sori per pinnulet, and color stopping more or less abruptly at the bases of pinnulets. It appears to be related to A. capillus-veneris and differs from that especially by the last character mentioned. It is a seasonal species, in California appearing with the winter (Nov–Apr) rains, and then drying and seemingly disappearing during the dry, nearly rainless summers.
The name Adiantum emarginatum Hook. (Sp. Fil. 2: 39, t. 75A. 1851, non Bory ex Willd., 1810, which has as its type a plant from Mauritius) has often been used for this species, but Hooker did not intend to describe a new taxon. Subsequent authors (e.g., D. C. Eaton, Ferns N. Amer. 1: 285. 1879) adopted A. emarginatum in a new (and illegitimate) sense, applying it to plants from California. Hooker’s original figure probably does represent A. jordanii and was drawn from a collection that had been mislabeled, according to Eaton.
A
The name Adiantum emarginatum Hook. (Sp. Fil. 2: 39, t. 75A. 1851, non Bory ex Willd., 1810, which has as its type a plant from Mauritius) has often been used for this species, but Hooker did not intend to describe a new taxon. Subsequent authors (e.g., D. C. Eaton, Ferns N. Amer. 1: 285. 1879) adopted A. emarginatum in a new (and illegitimate) sense, applying it to plants from California. Hooker’s original figure probably does represent A. jordanii and was drawn from a collection that had been mislabeled, according to Eaton.
A