Selaginella mixteca Mickel & Beitel
Descripción
Stems suberect to erect, stramineous, 4.5–13 cm long, 0.3–0.8 mm diam., not articulate, not flagelliform, stoloniferous, 2–3 times branched; rhizophores restricted to stem bases, mostly on underground stolons, filiform, 0.2–0.3 mm diam.; leaves of two kinds (anisophyllous) throughout stem length; lateral leaves broadly ovate to ovate-oblong, 2.3–3 X 1.3–1.7 mm, acroscopic bases rounded, strongly overlapping the stems, the basiscopic bases truncate to rounded, margins pale green, long-ciliate acroscopically, entire to denticulate distally and basiscopically, apices acute; median leaves broadly ovate to ovate-lanceolate, 1.2–1.9 X 0.7–1 mm, bases rounded or subcordate, margins hyaline, long-ciliate along proximal part of the stem, short-ciliate to denticulate above first branch, apices acute on leaves along proximal part of the stems, gradually long-acuminate to long-aristate on leaves above first branch, aristae half or less the lamina length, 0.1–0.5 mm long, both surfaces glabrous, without idioblasts; axillary leaves similar to lateral leaves or more oblong, bases exauriculate; strobili slightly lax and flattened, dorsiventral, 2–4 mm long; sporophylls weakly dimorphic, the dorsal ones green, spreading, the ventral ones pale green, ascending; megasporangia single at ventral base; microsporangia occupying most of the strobilus; megaspores pale yellow to lemon-yellow, striate-reticulate with close reticulum of low ridges, 320–360 µm diam.; microspores orange.A
Forma de vida
Epipétrica, TerrestreA
Ejemplar revisado
Oax (Hellwig & Whitaker 1269, 1272a, MEXU, NY, 1277, CAS, MICH, US; Mickel 6300, NY; Norris & Taranto 16526a, NY). Pue (Orcutt 1425, DS).A
Distribución
México (país) EndémicoA
Elevación
1350 – 2100 mA
Ecología y Hábitat
Along waterway banks, roadcuts, or on hillsides with limestone outcrops.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Because of its suberect to erect and stoloniferous habit, S. mixteca may be confused with S. prolifera, S. lineolata, S. finitima, and S. tuberosa. It differs from them chiefly by having longciliate to fimbriate, whitish or reddish scale-like leaves on the proximal and underground parts of the stems, and pale yellow to lemon-yellow megaspores.A