Selaginella arsenei Weath.
Descripción
Stems long-creeping, forming loose mats, to 10 cm long, 0.3–0.4 mm diam., radially symmetric, not readily fragmenting, tips straight, 0.3–0.4 mm diam., not articulate, not flagelliform, not stoloniferous, 1–2 times branched; rhizophores borne throughout stem length, stout, (0.1–)0.2–0.4 mm diam.; leaves of one kind (isophyllous) throughout, dull, grayish green (beige when old), ascending, linear, 1.8–3 X 0.3–0.4 mm, bases truncate, abruptly adnate to the stems, glabrous or infrequently pubescent, margins green, denticulate to entire, the teeth hyaline, ascending, ápices short-aristate, aristae hyaline to whitish, (0.1–)0.2–0.4 mm long; strobili quadrangular, 0.5–1.3 cm long; sporophylls monomorphic; megasporangia few, scattered on ventral side; microsporangia in two dorsal rows and scattered on ventral rows; megaspores lemonyellow, rugose to reticulate, 360–400 µm diam.; microspores orange, 40–50 µm diam.A
Forma de vida
Epipétrica, EpífitaA
Ejemplar revisado
Gro (Frye & Frye 3146, UC, US). Hgo (Frye & Frye 3149, DS, UC; Hitchcock & Stanford 7248, US; Stuessy 296, TEX; Tryon & Tryon 5133, MEXU). Qro (Arsène 9983, US, 10643, US; Basile 2, NY). SLP (Frye & Frye 2983, F, LL).A
Distribución
México (país) EndémicoA
Elevación
2700 mA
Ecología y Hábitat
On rock crevices.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Selaginella arsenei is characterized by its abruptly adnate leaf bases and by its relatively short aristae. It can be separated from S. sellowii by the characters given in the key, couplet 21. Selaginella arsenei may occasionally grow as an epiphyte on trees (Frye & Frye 2983).A