Selaginella polyptera Valdespino
Descripción
A. S. pulcherrima foliis conspicue dimorphis in caulibus principalibus infra ramos primos, foliis lateralibus patentibus, foliis medianis longiaristatis, aristis longitudine >1⁄3 foliorum aequantibus dignoscenda; a S. harrisii primo charactere differt. (Gr., poly, many, pteron, wing, alluding to the spreading, imbricate lateral leaves that give the apprearance of wings.)
Stems erect, fasciculate, to 45 cm tall, 1–1.5 mm diam., light green to stramineous, not articulate, not flagelliform, not stoloniferous, 2–4 times branched; rhizophores restricted to stem bases, stout, 0.3–0.8 mm diam.; leaves of two kinds (anisophyllous) throughout stem length; lateral leaves imbricate below first branch to distant, ovate to ovate-deltate, 2.5–4 X 1.5–2.6 mm, bases rounded, margins hyaline, long-ciliate proximally, denticulate distally, apices long-acuminate; median leaves appressed, broadly ovate to ovate-deltate, 1.5–2.5 X 1–1.5 mm, bases rounded or cordate, margins hyaline, long-ciliate proximally, denticulate distally, apices long-acuminate; axillary leaves broadly ovate to ovate, bases shortly biauriculate, margins ciliate proximally, denticulate distally, apices acuminate; strobili quadrangular, 3–10 mm long; sporophylls monomorphic (ventral ones sometimes lighter green); megasporangia scattered on two ventral rows; microsporangia in two dorsal rows and mixed on ventral rows; megaspores pale yellow, reticulate with a low equatorial flange, 250–300 µm diam.; microspores orange.A
Stems erect, fasciculate, to 45 cm tall, 1–1.5 mm diam., light green to stramineous, not articulate, not flagelliform, not stoloniferous, 2–4 times branched; rhizophores restricted to stem bases, stout, 0.3–0.8 mm diam.; leaves of two kinds (anisophyllous) throughout stem length; lateral leaves imbricate below first branch to distant, ovate to ovate-deltate, 2.5–4 X 1.5–2.6 mm, bases rounded, margins hyaline, long-ciliate proximally, denticulate distally, apices long-acuminate; median leaves appressed, broadly ovate to ovate-deltate, 1.5–2.5 X 1–1.5 mm, bases rounded or cordate, margins hyaline, long-ciliate proximally, denticulate distally, apices long-acuminate; axillary leaves broadly ovate to ovate, bases shortly biauriculate, margins ciliate proximally, denticulate distally, apices acuminate; strobili quadrangular, 3–10 mm long; sporophylls monomorphic (ventral ones sometimes lighter green); megasporangia scattered on two ventral rows; microsporangia in two dorsal rows and mixed on ventral rows; megaspores pale yellow, reticulate with a low equatorial flange, 250–300 µm diam.; microspores orange.A
Forma de vida
Epipétrica, TerrestreA
Ejemplar revisado
Chis (Breedlove 56384, CAS). Hgo (Fraile & Pérez 12a, ENCB; Hellwig 1235, NY; Moore 5080, BH, UC). Oax (Geith 95-M121, NY; Hallberg 1375, NY). SLP (King 4328,NY, TEX, UC, US; Mickel 599, NY). Ver (Bourgeau 2024, US; Nee & Taylor 26657, NY, UC). Bel (Bartlett 11321, UC).A
Elevación
180 – 1750 mA
Ecología y Hábitat
Among limestone rocks.A
Tipo de vegetación
Bosque de neblina/mesófiloA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Selaginella polyptera is part of a taxonomically confusing species group including S. acutifolia, S. harrisii, S. pallescens, and S. pulcherrima. It seems intermediate between S. pallescens and S. pulcherrima. Selaginella polyptera can be distinguished from S. pallescens by its axillary leaves broadly ovate to ovate (vs. ovate to ovate-lanceolate), with the bases subcordate (vs. cordate), with only an obscure outer auricle (vs. with inner and outer conspicuous auricles). It differs from S. harrisii and S. pulcherrima mainly by its obviously dimorphic, ascending to spreading (vs. leaves seemingly monomorphic, strongly clasping the stems) leaves on the main stems below the first branch.
Selaginella polyptera is remarkable by having median leaves on main stems with wide hyaline margins to ca. 4–6 cells wide and long-aristate apices, the aristae hyaline and ca. 1⁄3 or more as long as the lamina length.
A
Selaginella polyptera is remarkable by having median leaves on main stems with wide hyaline margins to ca. 4–6 cells wide and long-aristate apices, the aristae hyaline and ca. 1⁄3 or more as long as the lamina length.
A