Selaginella tuberosa B.McAlpin & Lellinger
Descripción
Stems suberect to erect, stramineous, 10–30 cm long, 0.5–1.4 mm diam., not articulate, not flagelliform, stoloniferous with tuber-like buds at the tip, 2–3 times branched; rhizophores restricted to proximal 1⁄4 of stems, filiform, 0.1–0.3 mm diam.; leaves of two kinds (anisophyllous) throughout stem length; lateral leaves broadly ovate to oblong, 2.8–4.5 X 1.6–2.5 mm, bases rounded, slightly or not overlapping stems, margins greenish to narrowly hyaline, long-ciliate at bases, denticulate distally, apices acute to obtuse, both surfaces glabrous, without conspicuous idioblasts; median leaves distant, elliptic, 1.8–3.5 X 1.3–1.6 mm, bases biauriculate, auricles long-ciliate, margins narrowly hyaline, minutely denticulate, apices short- to long-aristate, aristae half or less the lamina length, 0.3–0.9 mm long, both surfaces glabrous, with conspicuous idioblasts above, without idioblasts below; axillary leaves similar to lateral leaves or more oblong, bases rounded; strobili lax and flattened, dorsiventral, 2–4 mm long; sporophylls dimorphic, the dorsal ones green, spreading, the ventral ones pale green, ascending; megasporangia single at base of strobili; microsporangia occupying almost the entire strobilus; megaspores white to bone-white, with low ridges; microspores not seen.
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Forma de vida
Epipétrica, TerrestreA
Ejemplar revisado
Oax (Mickel 6193, NY).A
Elevación
1100 – 1900 mA
Ecología y Hábitat
On soil in coffee plantations, banks of waterways, road banks, or rocky slopes in premontane forests with a pronounced dry season.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Selaginella tuberosa is easily distinguished from related species by having lateral leaves with raised and frequently hyaline midribs and median leaves each with a well developed, long-ciliate inner auricle. McAlpin and Lellinger speculated that S. tuberosa was closely related to S. silvestris, a member of series Articulatae.
However, S. tuberosa has axillary or ventral rhizophores and lacks stem articulations, as well as lacking other characteristics that define series Articulatae (see Valdespino, 1993, for discussion).
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However, S. tuberosa has axillary or ventral rhizophores and lacks stem articulations, as well as lacking other characteristics that define series Articulatae (see Valdespino, 1993, for discussion).
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