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 vida
Usually epipetricA
Ejemplar revisado
Son (Mason 3202, ARIZ).A
Ecología y Hábitat
Rocky slopes and cliffs, usually on granitic or volcanic substrates; elevation unknown in Mexico, 1700–3000 m in North America.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
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