Argyrochosma limitanea (Maxon) Windham
Descripción
Rhizomes short, compact, horizontal; rhizome scales brown; fronds 5–30 cm, linear; stipes 1⁄3–1⁄2 the frond length, reddish brown to black, terete, glabrous; blades narrowly to broadly deltate, 3–5-pinnate proximally, coriaceous, abaxially covered by dense white farina, adaxially glabrous or sparsely glandular; rachises terete, glabrous adaxially, straight to somewhat flexuous; costae straight to slightly flexuous, branches not arising from prominent angles; ultimate segments not articulate to stalks, dark color of stalks passing into segment bases abaxially; segment margins recurved, often concealing sporangia; sporangia submarginal, borne on distal 1⁄2 of secondary veins, 32-spored.A
Forma de vida
Rupícola.B
Elevación
800 – 2800 mA
Tipo de vegetación
Matorral espinosoB
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
This species is distinct from A. incana and A. delicatula by the axis color passing into the segment bases. For the most part, these taxa have different geographic ranges, and genetic interaction between them is precluded because both are asexual triploids.
Key to the Mexican Subspecies of Argyrochosma limitanea
Blades broadly deltate, 4–5-pinnate, with basal pinnae at least 1⁄2 as long as blades; Chih, Son...........................................................................subsp. limitanea.
Blades lanceolate to oblong, 3–4-pinnate, with basal pinnae 1⁄4–1⁄3 as long as blades; widespread.......................................................................subsp. mexicana.
Argyrochosma limitanea subsp. limitanea (Maxon) Windham, Amer. Fern J. 77: 40. 1987
Blades broadly deltate, 4–5-pinnate, with proximal pinnae at least 1⁄2 as long as blades; n=2n=81, apogamous (Coah).
Distribution. Calcareous or non-calcareous cliffs and ledges; 800–2300 m. USA (Ariz, Calif, N Mex, Utah); Mexico.
Selected Specimens Examined. Chih (Bye & Weber 8321, MEXU, MICH; Correll 22634, US; Knobloch 1146, 8027, MSC; LeSueur 1127, GH, MICH, UC, US; Pringle 1583, MO). Son (Phillips 738, US; Shreve 6735, US; Wiggins 7127, DS; Wiggins & Rollins 443, DS).
Argyrochosma limitanea subsp. mexicana (Maxon) Windham, Contr. Univ. Michigan Herb. 19: 32. 1993
Notholaena limitanea subsp. mexicana Maxon, Amer. Fern J. 9 (3): 72. 1919
Blades lanceolate to oblong, 3–4-pinnate, proximal pinnae 1⁄4–1⁄3 the blade length; abaxially covered by white (rarely pale yellow) farina; n=2n=81, apogamous (USA).
Distribution. Rocky cliffs and slopes, usually calcareous; 1500–2800 m. USA (Ariz, N Mex, Tex); Mexico.
Selected Specimens Examined. Chih (Correll 23290, LL, NY). Coah (Stanford et al. 107, NY, US). Dgo (Palmer 465, NY). Hgo (Clark 7022, NY). NL (Favela 143, ENCB). Qro (Zamudio R. 3396, IEB). Sin (Breedlove 18521, NY). SLP (Lundell 5793, ARIZ, MICH). Tam (Stanford et al. 684, NY, UC, US). Zac (Dorado 1596, MEXU).
There are some specimens in Chihuahua that are intermediate between the two subspecies.
A
Key to the Mexican Subspecies of Argyrochosma limitanea
Blades broadly deltate, 4–5-pinnate, with basal pinnae at least 1⁄2 as long as blades; Chih, Son...........................................................................subsp. limitanea.
Blades lanceolate to oblong, 3–4-pinnate, with basal pinnae 1⁄4–1⁄3 as long as blades; widespread.......................................................................subsp. mexicana.
Argyrochosma limitanea subsp. limitanea (Maxon) Windham, Amer. Fern J. 77: 40. 1987
Blades broadly deltate, 4–5-pinnate, with proximal pinnae at least 1⁄2 as long as blades; n=2n=81, apogamous (Coah).
Distribution. Calcareous or non-calcareous cliffs and ledges; 800–2300 m. USA (Ariz, Calif, N Mex, Utah); Mexico.
Selected Specimens Examined. Chih (Bye & Weber 8321, MEXU, MICH; Correll 22634, US; Knobloch 1146, 8027, MSC; LeSueur 1127, GH, MICH, UC, US; Pringle 1583, MO). Son (Phillips 738, US; Shreve 6735, US; Wiggins 7127, DS; Wiggins & Rollins 443, DS).
Argyrochosma limitanea subsp. mexicana (Maxon) Windham, Contr. Univ. Michigan Herb. 19: 32. 1993
Notholaena limitanea subsp. mexicana Maxon, Amer. Fern J. 9 (3): 72. 1919
Blades lanceolate to oblong, 3–4-pinnate, proximal pinnae 1⁄4–1⁄3 the blade length; abaxially covered by white (rarely pale yellow) farina; n=2n=81, apogamous (USA).
Distribution. Rocky cliffs and slopes, usually calcareous; 1500–2800 m. USA (Ariz, N Mex, Tex); Mexico.
Selected Specimens Examined. Chih (Correll 23290, LL, NY). Coah (Stanford et al. 107, NY, US). Dgo (Palmer 465, NY). Hgo (Clark 7022, NY). NL (Favela 143, ENCB). Qro (Zamudio R. 3396, IEB). Sin (Breedlove 18521, NY). SLP (Lundell 5793, ARIZ, MICH). Tam (Stanford et al. 684, NY, UC, US). Zac (Dorado 1596, MEXU).
There are some specimens in Chihuahua that are intermediate between the two subspecies.
A