Selaginella arizonica Maxon
Descripción
Stems prostrate, forming rather loose mats, not readily fragmenting, dorsiventral, tips upturned in extremely dry conditions, 6–15 cm long, 0.5–0.7 mm diam., not articulate, not flagelliform, not stoloniferous, irregularly branched, branches determinate, 2–3 times branched; rhizophores borne throughout stem length, 0.2–0.3 mm diam.; leaves of one kind (isophyllous) throughout, tightly appressed to ascending, green, apices aristate, sometimes becoming acute by breaking off of aristae, aristae flattened, transparent to opaque, 0.1–0.3 mm, dentate at margins; upperside leaves linear-lanceolate, slightly falcate, 1.3–2.3 X 0.4–0.6 mm, bases abruptly adnate, pubescent or glabrous, margins green, ciliate, the cilia hyaline to opaque, spreading; underside leaves lanceolate, falcate, 2–2.5 X 0.5–0.6 mm, bases decurrent, glabrous, margins ciliate, the cilia hyaline to opaque, spreading or ascending; strobili quadrangular, 5–10 mm long; sporophylls monomorphic; megasporangia in two ventral rows; microsporangia in two dorsal rows; megaspores yellow, rugose to reticulate, 320–340 µm diam.; microspores orange.A
Forma de vida
Epipétrica, TerrestreA
Ejemplar revisado
BCS (Jones s.n., NY; Moran 18820, DS). NL (Hinton et al. 20084, MEXU, TEX, 21112, TEX). Son (Felger & Harris 16719, MEXU; Fischer 6858, ENCB; Mearns 2701, NY; Strickland & Felger 20481, ENCB; Wilkinson s.n., ENCB).A
Elevación
500 – 2200 mA
Ecología y Hábitat
In rock crevices or on gravel, on sandstone, igneous, or rarely limestone substrates.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Selaginella arizonica can be distinguished from the similar S. peruviana by its underside leaves broad and thin, versus narrow and fleshy in S. peruviana.A