Selaginella barnebyana Valdespino
Descripción
A S. huehuetenangensi foliis medianis suborbicularibus vel orbicularibus, apicibus aristatis viridulis, aristis longitudine 1⁄3–1⁄2 folium aequantibus, basibus subcordatis biauriculatis, megasporis rugoso-reticulatis differt. (Dedicated to the late Rupert Barneby, distinguished student of legumes at The New York Botanical Garden.)
Stems creeping, stramineous, ca. 30 cm long, 0.7–1.6 mm diam., not articulate, not flagelliform, not stoloniferous, 2–3 times branched; rhizophores borne throughout stem length, stout, 0.3–0.7 mm diam.; leaves of two kinds (anisophyllous) throughout, lacking idioblasts; lateral leaves ovate-oblong, 1.7–2.5 X 0.7–1.1 mm, bases subcordate, margins greenish to slightly hyaline, long-ciliate on acroscopic bases, denticulate to entire distally, apices obtuse to broadly acute, upper surfaces corrugate, lower surfaces glabrous, without idioblasts; median leaves suborbicular to orbicular, 0.9–1.4 X 0.7–1 mm, bases subcordate to auriculate, auricles ciliate, margins greenish proximally, hyaline distally, long-ciliate (particularly the inner margin and the distal 1⁄2 of outer margin), apices long-acuminate, tips 0.4–0.7 mm (1⁄3–1⁄2 the lamina length), upper surfaces corrugate; axillary leaves ovate to ovate-lanceolate, bases subcordate, margins longciliate proximally, denticulate distally, apices acute to broadly acute; strobili quadrangular, 3–17 mm long; sporophylls monomorphic; megasporangia along ventral two rows; microsporangia in dorsal two rows or occupying most of strobili; megaspores white or cream, without equatorial flange, rugose-reticulate, 250–300 µm diam.; microspores orange.A
Stems creeping, stramineous, ca. 30 cm long, 0.7–1.6 mm diam., not articulate, not flagelliform, not stoloniferous, 2–3 times branched; rhizophores borne throughout stem length, stout, 0.3–0.7 mm diam.; leaves of two kinds (anisophyllous) throughout, lacking idioblasts; lateral leaves ovate-oblong, 1.7–2.5 X 0.7–1.1 mm, bases subcordate, margins greenish to slightly hyaline, long-ciliate on acroscopic bases, denticulate to entire distally, apices obtuse to broadly acute, upper surfaces corrugate, lower surfaces glabrous, without idioblasts; median leaves suborbicular to orbicular, 0.9–1.4 X 0.7–1 mm, bases subcordate to auriculate, auricles ciliate, margins greenish proximally, hyaline distally, long-ciliate (particularly the inner margin and the distal 1⁄2 of outer margin), apices long-acuminate, tips 0.4–0.7 mm (1⁄3–1⁄2 the lamina length), upper surfaces corrugate; axillary leaves ovate to ovate-lanceolate, bases subcordate, margins longciliate proximally, denticulate distally, apices acute to broadly acute; strobili quadrangular, 3–17 mm long; sporophylls monomorphic; megasporangia along ventral two rows; microsporangia in dorsal two rows or occupying most of strobili; megaspores white or cream, without equatorial flange, rugose-reticulate, 250–300 µm diam.; microspores orange.A
Forma de vida
TerrestreA
Ejemplar revisado
Chis (Gittins 4244, 4251, NY; Matuda 2782, NY; Méndez 5731, CAS; Münch 2, DS, 39, DS, NY, US).A
Distribución
México (país) EndémicoA
Elevación
1000 – 1400 mA
Ecología y Hábitat
On slopes or epipetric on shaded, wet rocks.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Specimens of S. barnebyana were treated by Smith (1981) as S. huehuetenangensis.
Selaginella barnebyana has long-aristate leaf apices resembling those of S. huehuetenangensis, but S. barnebyana seems to be restricted to high elevations (1000–1400 m), whereas S. huehuetenangensis is found at low elevations (600 m or less). Selaginella barnebyana differs further from S. huehuetenangensis by having median leaves suborbicular to orbicular (vs. ovate-lanceolate or broadly ovate), with green and stouter (vs. hyaline and delicate) apices that are 1⁄3–1⁄2 (vs. 1⁄2 or more) the lamina length, the bases subcordate (vs. oblique) with inner and outer (vs. outer only) auricular lobes, both auricles with long cilia, the distal 1⁄2 of the margins obscurely (vs. conspicuosly) hyaline. Furthermore, S. barnebyana is distinct in axillary leaves with greenish to obscurely (vs. broadly) hyaline margins; lateral leaves with acroscopic margins greenish to obscurely (vs. broadly) hyaline; and megaspores rugose-reticulate (vs. granulate to tuberculate).
Selaginella barnebyana can be confused with S. guatemalensis, from which it differs by its median leaves suborbicular to orbicular or broadly ovate (vs. ovate to ovate-lanceolate), with longaristate (vs. acute to acuminate) apices 1⁄3–1⁄2 (vs. 1⁄4) the lamina length.
This species is part of the S. flexuosa group (see S. chiapensis for discussion).
A
Selaginella barnebyana has long-aristate leaf apices resembling those of S. huehuetenangensis, but S. barnebyana seems to be restricted to high elevations (1000–1400 m), whereas S. huehuetenangensis is found at low elevations (600 m or less). Selaginella barnebyana differs further from S. huehuetenangensis by having median leaves suborbicular to orbicular (vs. ovate-lanceolate or broadly ovate), with green and stouter (vs. hyaline and delicate) apices that are 1⁄3–1⁄2 (vs. 1⁄2 or more) the lamina length, the bases subcordate (vs. oblique) with inner and outer (vs. outer only) auricular lobes, both auricles with long cilia, the distal 1⁄2 of the margins obscurely (vs. conspicuosly) hyaline. Furthermore, S. barnebyana is distinct in axillary leaves with greenish to obscurely (vs. broadly) hyaline margins; lateral leaves with acroscopic margins greenish to obscurely (vs. broadly) hyaline; and megaspores rugose-reticulate (vs. granulate to tuberculate).
Selaginella barnebyana can be confused with S. guatemalensis, from which it differs by its median leaves suborbicular to orbicular or broadly ovate (vs. ovate to ovate-lanceolate), with longaristate (vs. acute to acuminate) apices 1⁄3–1⁄2 (vs. 1⁄4) the lamina length.
This species is part of the S. flexuosa group (see S. chiapensis for discussion).
A