Selaginella martensii Spring
Descripción
Stems suberect, branching from proximal 2⁄3, stramineous to pale green, 2–2.5 mm diam., not articulate, not flagelliform, not stoloniferous; rhizophores in proximal 1⁄3–2⁄3 of stems, stout, mostly 0.8–1.2 mm diam.; leaves of two kinds (anisophyllous) throughout stem length; lateral leaves obliquely oblong, 3.5–5 mm long, bases rounded, margins denticulate to entire, rarely with a few long cilia at bases, apices obtuse; median leaves ovate, midribs prominent, aristae 0.8–1 mm long, bases each with one basiscopic auricle, margins slightly white-bordered, long-ciliate to denticulate distally, apices long-aristate; axillary leaves ovate, bases cordate, exauriculate, with a few cilia at bases, otherwise denticulate to entire, apices obtuse; strobili quadrangular, 3–15 mm long; sporophylls monomorphic; megasporangia in two ventral rows; microsporangia in two dorsal rows; megaspores white, 200–300 µm diam.; microspores orange-tan, with low broad papillae coalescing into ridges, shed mostly in tetrads.A
Forma de vida
TerrestreA
Ejemplar revisado
Chis (Breedlove 33634, NY; Martínez et al. 19402, NY). Méx (Schaffner 6, NY). Oax (Mickel 6151 *, 6352 *, NY, US; Torres & Martínez 5979, NY). Qro (Díaz-Barriga 4890, QMEX; Díaz-Barriga & Carranza 6510, QMEX). SLP (Pringle 3293, NY p.p., US). Ver (Nee & Taylor 29467, NY; Ortega 244, MEXU, NY).A
Elevación
130 – 2300 mA
Tipo de vegetación
Bosque de neblina/mesófiloA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Selaginella martensii is distinguishable by its thick, straight rhizophores, long-aristate median leaves with ciliate (to denticulate) margins and basiscopic auricles, large lateral leaves 3.5–5 mm long with only a few short hairs at bases, and broad stems 2–2.5 mm wide.
As pointed out by Mickel and Beitel (1988), some specimens of S. martensii from Oaxaca (two of which are cited here and marked by an asterisk) have long-ciliate median leaves with prominent idioblasts and lateral leaves with ciliate bases; they may represent a distinct taxon restricted to Oaxaca.
Selaginella stenophylla is similar to S. martensii in being suberect with stout rhizophores, with ciliate-denticulate to shortciliate, long-aristate median leaves, and denticulate lateral axillary leaves. Selaginella stenophylla differs in having idioblasts on the median and lateral leaves, which are smaller (1.8–3 mm long), strongly winged, dimorphic sporophylls and cream-colored megaspores. See S. lineolata for comparison of it with S. stenophylla.
A
As pointed out by Mickel and Beitel (1988), some specimens of S. martensii from Oaxaca (two of which are cited here and marked by an asterisk) have long-ciliate median leaves with prominent idioblasts and lateral leaves with ciliate bases; they may represent a distinct taxon restricted to Oaxaca.
Selaginella stenophylla is similar to S. martensii in being suberect with stout rhizophores, with ciliate-denticulate to shortciliate, long-aristate median leaves, and denticulate lateral axillary leaves. Selaginella stenophylla differs in having idioblasts on the median and lateral leaves, which are smaller (1.8–3 mm long), strongly winged, dimorphic sporophylls and cream-colored megaspores. See S. lineolata for comparison of it with S. stenophylla.
A