Argyrochosma fendleri (Kunze) Windham

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Argyrochosma fendleri (Kunze) Windham

Descripción

Rhizomes compact, horizontal to ascending, 2–3 mm diam.; rhizome scales concolorous orange-brown, linear-lanceolate, 7–10 mm; fronds 5–25 cm long, clumped; stipes 1⁄2 the frond length, castaneous, 0.75–1.5 mm diam., terete, glabrous; blades deltate, 4–6-pinnate proximally; rachises terete, glabrous, strongly flexuous; pinnae 4–5 pairs, costae of pinnae and pinnules strongly flexuous; ultimate segments not articulate, dark color of stalks continuing into segment bases abaxially, coriaceous, covered by whitish farina, adaxially glabrous or with scattered farina; segment margins plane to recurved, often partially concealing sporangia; veins usually obscure adaxially; sori submarginal, borne on distal 1⁄4 of veins; sporangia 64-spored; 2n=54 (USA).A

Forma de crecimiento

Hierba

Forma de vida

Usually epipetricA

Nutrición

Autotrófica

Ejemplar revisado

Son (Mason 3202, ARIZ).A

Distribución

México (país) Nativo y no endémicoA, Norteamérica al N de México PresenteA

Elevación

data unavailable

Ecología y Hábitat

Rocky slopes and cliffs, usually on granitic or volcanic substrates; elevation unknown in Mexico, 1700–3000 m in North America.A

Tipo de vegetación

No especificado

Categoría IUCN

No incluidaB

Categoría NOM-059-SEMARNAT-2010

No incluidaC

Estatus del taxón

(A) Como definida actualmente, probablemente una entidad natural (monofilética)

Discusión taxonómica

Argyrochosma fendleri is distinct by its strongly flexuous rachises and rachillae. Argyrochosma limitanea has slightly flexuous rachises and costae, but the frond axes are not so strongly spreading, and this species is more widespread in Mexico. All specimens of A. limitanea with slightly flexuous rachises and costae have 32 spores per sporangium, whereas specimens of A. fendleri consistently have 64.A

Bibliografía

A. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88
B. IUCN 2022: The IUCN Red List of Threatened Species. Versión 2022-2
C. SEMARNAT 2019: MODIFICACIÓN del Anexo Normativo III, Lista de especies en riesgo de la Norma Oficial Mexicana NOM-059-SEMARNAT-2010: 101 pp. – https://www.dof.gob.mx/nota_detalle.php?codigo=5578808&fecha=14/11/2019#gsc.tab=0 [accessed 2023-05-04 06:16]