Notholaena grayi Davenp.
Descripción
Rhizomes compact, horizontal, 1.5–2.5 mm diam.; rhizome scales linear-lanceolate, 2–4 mm long, concolorous, sclerotic, dark reddish brown (to black with age), apices pale, flexuous, capillary-tipped, margins with pale weak hairs in the proximal two-thirds of the scale and short, dark, stiff teeth distally; fronds (8–)12–23(–35) cm long, clumped; stipes 1⁄5–1⁄3(–1⁄2) the frond length, light brown to dark castaneous, terete, farinose-glandular and with sparse, linear-lanceolate, reddish brown scales 2–3 mm long, these with weak pale hairs and occasional dark, short-stiff teeth distally; blades narrowly oblong to lanceolate, 1.5–2.5 cm wide, bipinnate to bipinnate-pinnatifid; pinnae (6–)8–10 pairs, sessile, the segments nearly equilateral, narrowly to broadly deltate, the basiscopic pinnules slightly longer than the acroscopic; pinnules 1–3 pairs per pinna, oblong, obtuse, sessile; segments not articulate, the color of the costae passing into the bases of the segments; adaxial blade surfaces sparsely farinose; abaxial surfaces densely white-farinose with scattered, orange-tan, linearlanceolate, entire scales 1–1.5 mm long; laminar margins somewhat recurved; spores brown; 2n=60, n=2n=90 (USA).
A
A
Ejemplar revisado
Chih (Correll & Johnston 21759, MSC, NY; Pringle 463, NY) Coah (Palmer 1388, NY). Dgo (González 1276, CHAPA, ENCB). Hgo (Pray 3106, LAM). Jal (Pringle 5373, GH). NL (Hernández I. s.n., 25 Aug 1976, ENCB). Sin (White 4046, ARIZ). Son (Wiggins 7400, US). Zac (Pray 3137, LAM).A
Elevación
350 – 1300 mA
Ecología y Hábitat
Rocky slopes and cliffs, on a variety of substrates, including both granite and limestone.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Notholaena grayi resembles Argyrochosma pallens but is distinguished by the orange blade scales, sessile pinnae, light brown stipes, and weakly ciliate scales of rhizomes and stipes. It is also close to N. aliena (which see) and superficially to N. schaffneri, but the latter has ciliate-denticulate rhizome scales and bristlelike laminar scales rather than flat scales, and darker stipe color.
Notholaena grayi includes two cytotypes, which were treated as subspecies by Windham (1993). Sexually reproducing diploid populations (N. grayi subsp. sonorensis) occur in southern Arizona and western Mexico. The two differ only in chromosome number and the associated spore size and number of spores per sporangium and are not formally recognized here. In the diploid, most sporangia contain 32 spores, and the spores generally measure less than 55 µm. In the apogamous triploid, most sporangia contain 16 spores, and the spores generally measure more than 55 µm.A
Notholaena grayi includes two cytotypes, which were treated as subspecies by Windham (1993). Sexually reproducing diploid populations (N. grayi subsp. sonorensis) occur in southern Arizona and western Mexico. The two differ only in chromosome number and the associated spore size and number of spores per sporangium and are not formally recognized here. In the diploid, most sporangia contain 32 spores, and the spores generally measure less than 55 µm. In the apogamous triploid, most sporangia contain 16 spores, and the spores generally measure more than 55 µm.A