Selaginella mickelii Valdespino
Descripción
Stems erect from a creeping or decumbent rhizomatous and stoloniferous base, light-green to stramineous, to 45 cm tall, 1–2 mm diam. (on erect stems) or 0.2–0.9 mm diam. (on creeping stems), not articulate, 2–4 times branched, frond-like, stolons restricted to proximal part of stems, apices of both stem and branches often flagelliform, flagelliform tips usually longcreeping, touching ground and sending up erect frond-like branches; rhizophores restricted to bases of erect stems or throughout on creeping stems and flagelliform tips, 0.5–1 mm diam. (on erect stems) or 0.2–0.4 mm diam. (on creeping stems and flagelliform tips); leaves of two kinds (anisophyllous) throughout stem length; lateral leaves conspicuously corrugate or wrinkled, mostly dimorphic on creeping stems, strongly appressed and curling inward to first branch (or beyond), dimorphic on erect stems above first branch, sometimes curling inward, ovate, 2–3.5 X 1.2–2.1 mm (1⁄4 to 1⁄3 less so on branches and creeping stems), acroscopic bases rounded, strongly overlapping stems, basiscopic bases truncate, margins green, longciliate proximally, denticulate distally, apices acute to obtuse; median leaves on erect stems imbricate, appressed, ovate, 1.5–3.3 X 1–2.3 mm, bases cordate with unequal auricles, margins hyaline to obscurely so, long-ciliate throughout, or denticulate distally, apices acuminate to short-aristate; axillary leaves ovatelanceolate to lanceolate, bases cordate to rounded, usually auriculate, auricles ciliate, margins ciliate in proximal 3⁄4, distal 1⁄4 obscurely denticulate, apices acute to narrowly-obtuse; strobili quadrangular, 0.3–2 cm long; sporophylls monomorphic or ventral ones sometimes lighter green; megasporangia usually in two ventral rows; microsporangia usually in two dorsal rows; megaspores white, sometimes with a low equatorial flange, granulose to low-reticulate, 230–320 µm diam.; microspores light-orange, rugose-granular to baculate, 19–25 µm diam.A
Forma de vida
Epipétrica, TerrestreA
Ejemplar revisado
Chis (Breedlove 56801, ENCB, MICH, NY; Matuda 3691, LL, MICH, NY). Oax (Mexia 9190, ARIZ, LL, MICH, NY, UC; Mickel 7198, NY). Tab (Gilly & Hernández 282, MICH, MSC, TEX; Martínez et al. 8540, NY; Rovirosa 615, NY, PH; Zamudio 207, NY). Ver (Martínez Calderón 1744, MEXU; Nee & Diggs 24744, F, MICH, MO, NY, TEX, XAL).A
Distribución
México (país) EndémicoA
Elevación
0 – 1200 mA
Ecología y Hábitat
On rocky stream banks, steep slopes and ravines, limestone cliffs, and roadsides.A
Tipo de vegetación
Selva altaA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Specimens of S. mickelii have previously been referred to S. Mollis A. Braun of Colombia and Venezuela, but S. mickelii is distinct by the flagelliform stem apices. Within Mexico S. mickelii mostly closely resembles S. illecebrosa, the former being distinct by the leaves on the main stems short-ciliate along margins (vs. ciliate at leaf bases), median and axillary leaves long-ciliate along margins (vs. entire except at leaf bases), and the stems often flagelliform (vs. non-flagelliform).A