Selaginella prolifera Valdespino
Descripción
S. flagellata foliis medianis, foliis lateralibus, et sporophyllis marginibus ciliatis, superne idioblastis in structis diversa. (L. proliferus, producing offshoots, referring to the upright stems that arise from stolons.)
Stems suberect to erect, stramineous, 4–20 cm long, 0.3–0.6 mm diam., not articulate, not flagelliform, stoloniferous, 2–3 times branched; rhizophores restricted to proximal 1⁄4–1⁄3(–1⁄2) of stems, filiform, ca. 0.2 mm diam.; leaves of two kinds (anisophyllous) throughout stem length; lateral leaves narrowly oblong to oblong-ovate, 2–3 X 0.9–1.4 mm, bases rounded to subcordate, strongly overlapping stems acroscopically, margins narrowly hyaline to pale green, long-ciliate proximally, minutely denticulate or entire distally, apices acute, both surfaces glabrous, with idioblasts; median leaves broadly ovate-elliptic or ovateoblong, 1.3–1.6 X 0.7–1.2 mm, outer base with a well developed auricle, margins hyaline, long-ciliate, apices long-aristate, aristae half or more the lamina length, 0.5–0.7 mm long, both surfaces glabrous, upper surfaces with idioblasts; axillary leaves lanceolate to lance-ovate, bases rounded, margins pale green to hyaline, long-ciliate proximally, denticulate distally, apices acute; strobili loosely quadrangular to weakly flattened, 2–9 mm long; sporophylls slightly dimorphic, the dorsal ones green, spreading to ascending, the ventral ones pale green, ascending; megasporangia generally in two ventral rows or at the base of ventral rows, or infrequently absent; microsporangia in two dorsal rows, frequently also on the apical region of ventral side of strobili, or strobili wholly microsporangiate; megaspores snow-white, without an equatorial flange or with a slightly developed one, granulose-striate to granulose-reticulate with high ridges, 220–255 µm diam.; microspores orange.
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Stems suberect to erect, stramineous, 4–20 cm long, 0.3–0.6 mm diam., not articulate, not flagelliform, stoloniferous, 2–3 times branched; rhizophores restricted to proximal 1⁄4–1⁄3(–1⁄2) of stems, filiform, ca. 0.2 mm diam.; leaves of two kinds (anisophyllous) throughout stem length; lateral leaves narrowly oblong to oblong-ovate, 2–3 X 0.9–1.4 mm, bases rounded to subcordate, strongly overlapping stems acroscopically, margins narrowly hyaline to pale green, long-ciliate proximally, minutely denticulate or entire distally, apices acute, both surfaces glabrous, with idioblasts; median leaves broadly ovate-elliptic or ovateoblong, 1.3–1.6 X 0.7–1.2 mm, outer base with a well developed auricle, margins hyaline, long-ciliate, apices long-aristate, aristae half or more the lamina length, 0.5–0.7 mm long, both surfaces glabrous, upper surfaces with idioblasts; axillary leaves lanceolate to lance-ovate, bases rounded, margins pale green to hyaline, long-ciliate proximally, denticulate distally, apices acute; strobili loosely quadrangular to weakly flattened, 2–9 mm long; sporophylls slightly dimorphic, the dorsal ones green, spreading to ascending, the ventral ones pale green, ascending; megasporangia generally in two ventral rows or at the base of ventral rows, or infrequently absent; microsporangia in two dorsal rows, frequently also on the apical region of ventral side of strobili, or strobili wholly microsporangiate; megaspores snow-white, without an equatorial flange or with a slightly developed one, granulose-striate to granulose-reticulate with high ridges, 220–255 µm diam.; microspores orange.
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Forma de vida
Epipétrica, TerrestreA
Ejemplar revisado
Chis (Breedlove 37635A, DS). Gro (Langlassè 421, GH, MEXU, US). Oax (Hallberg 1655, NY; Hellwig 1319, MEXU; Mickel 5128, 5144, 5972, 6912, NY, UC; Orcutt 5238, DS; Williams 9800, F). Nic (Hitchcock s.n., 1–8 Nov 1911, US; Maxon 7745, US, 7750a, US; Oersted 2078, US).A
Elevación
50 – 900 mA
Ecología y Hábitat
On banks of waterways, shaded roadside banks, or on moist rocky banks.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Mickel and Beitel (1988) treated most collections of S. prolifera from Oaxaca as S. rhizophora Baker. We now agree with other authors (e.g., Alston, 1955; Lellinger, 1989; Smith, 1981) in concluding that S. rhizophora is conspecific with S. flagellata. Thus, specimens representing S. rhizophora as defined by Mickel and Beitel (1988) are in need of a name, which is provided here.
Selaginella prolifera differs from S. flagellata by having median and lateral leaves and sporophylls with ciliate (vs. denticulate) margins and upper surfaces with (vs. without) idioblasts. The upright stems in S. prolifera arise from underground or partially buried stolons. In addition to this characteristic, S. prolifera also agrees with other erect to suberect species such as S. lineolata, S. finitima, and S. tuberosa in having the median leaves with an outer auricle; this suggests a close relationship among these taxa.
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Selaginella prolifera differs from S. flagellata by having median and lateral leaves and sporophylls with ciliate (vs. denticulate) margins and upper surfaces with (vs. without) idioblasts. The upright stems in S. prolifera arise from underground or partially buried stolons. In addition to this characteristic, S. prolifera also agrees with other erect to suberect species such as S. lineolata, S. finitima, and S. tuberosa in having the median leaves with an outer auricle; this suggests a close relationship among these taxa.
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