Cheilanthes yatskievychiana Mickel
Descripción
A C. bonariense pilis abaxialiter albis rectis, pilis stipitum rachidum catenatis rectis, squamis rhizomatum concoloribus brunneis pallidis non-lustratis diversa. (Dedicated to Dr. George A. Yatskievych, who called this specimen to our attention.)
Rhizomes slender, 1 mm diam (4 mm incl. scales and stipe bases), compact, horizontal; rhizome scales linear-lanceolate, concolorous pale brown, dull, ca. 3 mm long, entire; fronds 10–15 cm long, clumped; stipes 1⁄4–1⁄3 the frond length, dark reddish brown to black with age, terete, ca. 0.6 mm diam. with abundant, lax, catenate hairs to 1 mm long, hairs deciduous with age; blades linear, 6–8 mm wide; pinnae 16–22 pairs, oblong, shallowly lobed, articulate, short-stalked ca. 1 mm; both surfaces densely clothed with straight white hairs, these obscuring the surfaces; sporangia at vein ends, laminar margins slightly curved, undifferentiated; spores tan.A
Rhizomes slender, 1 mm diam (4 mm incl. scales and stipe bases), compact, horizontal; rhizome scales linear-lanceolate, concolorous pale brown, dull, ca. 3 mm long, entire; fronds 10–15 cm long, clumped; stipes 1⁄4–1⁄3 the frond length, dark reddish brown to black with age, terete, ca. 0.6 mm diam. with abundant, lax, catenate hairs to 1 mm long, hairs deciduous with age; blades linear, 6–8 mm wide; pinnae 16–22 pairs, oblong, shallowly lobed, articulate, short-stalked ca. 1 mm; both surfaces densely clothed with straight white hairs, these obscuring the surfaces; sporangia at vein ends, laminar margins slightly curved, undifferentiated; spores tan.A
Ejemplar revisado
Known only from the type collection. Son (Burquez M., 96-302, MO).A
Distribución
México (país) EndémicoA
Elevación
800 mA
Ecología y Hábitat
In deep canyon.A
Tipo de vegetación
Bosque de otro tipoA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
This species superficially resembles the widespread C. bonariensis in the linear blades with shallowly lobed pinnae and abundant laminar hairs, but C. yatskievychiana can be readily distinguished by the abaxial hairs white and straight (vs. rusty and tangled), stipe and rachis hairs catenate, straight, nonglandular (vs. curved at base and glandular), rhizome scales concolorous pale brown and dull (vs. strongly bicolorous and lustrous), and fronds only 10–15 cm long (vs. to 75 cm); it has been found only in Sonora (vs. distribution throughout Mexico except for the Yucatan Peninsula and northern Baja California).A