Argyrochosma jonesii (Maxon) Windham
Descripción
Rhizomes short, compact, horizontal; rhizome scales 5–7 X 0.3 mm, dark brown, linear; fronds 4–15 cm long, clumped; stipes 1⁄2 to 2⁄3 the frond length, castaneous to dark brown, terete; blades ovate-lanceolate, 2–3-pinnate; abaxial and adaxial surfaces glabrous; rachises straight, terete or adaxially flattened to shallowly grooved; segments orbicular to ovate, not articulate, the dark color of stalks continuing into segment bases abaxially; segment margins plane to slightly recurved, not concealing sporangia; sori submarginal, on distal 1⁄2 of secondary veins; sporangia 64-spored; 2n=54, 108 (USA).A
Forma de vida
Usually epipetric.A
Ejemplar revisado
Son (Burgess 5759, ARIZ; Fischer & Yatskievych 82–12, 82–23, ARIZ).
Unverified, Doubtful, or Mistaken Reports. BCN (reported by Wiggins, 1980, but not verified).
A
Unverified, Doubtful, or Mistaken Reports. BCN (reported by Wiggins, 1980, but not verified).
A
Elevación
800 mA
Ecología y Hábitat
Calcareous cliffs and ledges. 600–1900 m in USA.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Windham (1993) reported two sexually reproducing cytotypes in the southwestern United States. The diploid is known from a few localities in the Sonoran and Mojave deserts; the tetraploid is found throughout the Mojave Desert and cismontane southern California. Argyrochosma jonesii most closely resembles A. lumholtzii, but the former can be readily distinguished by the castaneous to brownish stipes and rachises.A