Selaginella chiapensis A.R.Sm.
Descripción
Stems creeping, stramineous, ca. 20 cm long, 0.4–1.2 mm diam., not articulate, not flagelliform, not stoloniferous, 2–3 times branched; rhizophores borne throughout stem length, filiform to stout, 0.2–0.5 mm diam.; leaves of two kinds (anisophyllous) throughout stem length; lateral leaves ovate, 1.7–2.7 X 0.8–1.3 mm, bases rounded, margins slightly hyaline, long-ciliate proximally, denticulate to entire distally, apices obtuse to broadly acute, upper surfaces slightly corrugate, papillate, lower surfaces glabrous, with idioblasts; median leaves broadly ovate to orbicular, 0.9–1.5 X 0.6–1 mm, bases subcordate, margins hyaline to greenish, long-ciliate, apices acuminate, upper surfaces corrugate, papillate and with obscure idioblasts; axillary leaves ovatelanceolate, bases rounded, margins long-ciliate, entire to denticulate distally, apices obtuse to broadly acute; strobili quadrangular, 3–8 mm long; sporophylls monomorphic or slightly dimorphic; megasporangia few, basal in ventral rows; microsporangia in dorsal rows and distally in ventral rows; megaspores white, reticulate, 300–400 µm diam.; microspores tan-orange.A
Forma de vida
TerrestreA
Ejemplar revisado
Chis (Carlson 2127, ENCB, US). Oax (Hallberg 1625b, NY, US, 1648, NY; Lawton TS-14b, NY; Mickel 5861, 6497, NY).A
Distribución
México (país) EndémicoA
Elevación
100 – 820 mA
Ecología y Hábitat
On steep slopes and roadsides and woods along streams.A
Tipo de vegetación
Selva altaA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
In this species, the megasporophylls tend to be slightly broader than the microsporophylls. Selaginella chiapensis belongs to a species group that includes, in Mexico, S. barnebyana, S. corrugis, S. flexuosa, S. guatemalensis, S. huehuetenangensis, and S. subrugosa, which are here informally termed the “S. flexuosa group.” They can be set apart by the characters given in the key. Additionally, S. chiapensis is separated from its close relative, S. guatemalensis, by its broadly ovate to orbicular (vs. ovate to ovate-lanceolate) median leaves and by its lateral leaves perpendicular to the stems (vs. ascending at 45–60°). Selaginella chiapensis differs further from S. barnebyana and S. huehuetenangensis by its acuminate (vs. long-aristate) median leaves.
To the “S. flexuosa group” also belong S. idiospora Alston (Guatemala to Costa Rica), S. denudata (Willd.) Spring (Jamaica), S. krugii Hieron. (Puerto Rico), S. macrostachya (Spring) Spring (Brazil), and possibly S. mendocae Hieron. and S. contigua Baker (both from Brazil). This group is in need of revision to ascertain relationships and distributions of the species.
A
To the “S. flexuosa group” also belong S. idiospora Alston (Guatemala to Costa Rica), S. denudata (Willd.) Spring (Jamaica), S. krugii Hieron. (Puerto Rico), S. macrostachya (Spring) Spring (Brazil), and possibly S. mendocae Hieron. and S. contigua Baker (both from Brazil). This group is in need of revision to ascertain relationships and distributions of the species.
A