Selaginella gypsophila A.R.Sm. & T.Reeves
Descripción
Stems densely caespitose, rosette-forming, inrolled when dry, green above, yellowish or whitish green below, older leaves drying uniformly tan, branches strongly ascending, 3–5 cm long, 0.4–0.6 mm diam., not articulate, not flagelliform, not stoloniferous; rhizophores restricted to stem bases, ca. 0.4 mm diam.; leaves of two kinds (anisophyllous) throughout stem length; median and lateral leaves closely imbricate, oblong to oblonglanceolate, acutish or narrowly rounded at apex, margins green or inconspicuously hyaline, entire, sparingly denticulate, or long-ciliate proximally and denticulate distally; lateral leaves 1.4–2 mm X 0.7–0.9 mm, ciliolate along acroscopic margins, mostly entire along basiscopic margins (except at bases), lower surfaces with broad whitish opaque margins to ca 0.3 mm wide and a green central band equal to or less than the width of the whitish margins, upper surfaces with green central band much broader than whitish margins; median leaves lanceolate, 1–1.3 mm X 0.4–0.5 mm, bases pubescent, margins broad, whitish, 0.15–0.2 mm wide, color pattern reversed from that of lateral leaves, upper surfaces with narrow dark green median band, lower surfaces with broad green median band, apices acute to narrowly rounded; axillary leaves similar to lateral leaves but more nearly equilateral and ciliolate along both margins, bases with two minute, ciliolate lobes; strobili quadrangular, to 1.5 cm long; sporophylls monomorphic; megasporangia few, basal, in a vertical row in strobilus, or scattered in one or two vertical rows; microsporangia in vertical rows or scattered; megaspores yellow, with fine reticulate ridges, but at low magnification (30X) appearing smooth, ca. 300 µm diam.; microspores bright orangish red, capitate-papillate or tuberculate, shed in tetrads and singly.A
Forma de vida
Epipétrica.A
Ejemplar revisado
NL (Dorr 2550, MEXU, TEX, UC; Hansen et al. 3859, MEXU; Hinton 18751, MEXU).A
Distribución
México (país) EndémicoA
Elevación
2100 mA
Ecología y Hábitat
In rock crevices, dry gypsum hillsides.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Selaginella gypsophila is distinguished from S. pilífera by its rounded (vs. long-aristate) leaf apices.A