Selaginella porphyrospora A.Braun
Descripción
Stems creeping, ascending to suberect, stramineous or greenish, (3–)5–12(–23) cm long, 0.2–0.5 mm diam., not articulate, frequently with flagelliform, gemmiferous apices, stoloniferous, 1–3 times branched; rhizophores restricted to proximal 1⁄3–1⁄2 of stems, filiform, 0.1–0.3 mm diam.; leaves of two kinds (anisophyllous) throughout stem length; lateral leaves ovate, 2–3.4 X 1–2 mm, bases rounded to subcordate, acroscopic bases strongly overlapping stems, margins hyaline, denticulate or ciliatedenticulate proximally, denticulate distally, pale green, entire to sparsely denticulate, apices acuminate, upper surfaces usually hispid, especially near basiscopic margins, one or both surfaces usually with one long idioblast along each side of midribs, or occasionally idioblasts absent; median leaves ovate to ovatelanceolate, 0.9–1.5 X 0.5–0.9 mm, bases rounded to subcordate, margins hyaline, sparingly denticulate, apices abruptly aristate, aristae half to nearly equalling the expanded lamina length; axillary leaves ovate-lanceolate, bases rounded, exauriculate, margins entire, apices acute; strobili lax and flattened, dorsiventral, or occasionally weakly quadrangular, 3–20 mm long; sporophylls dimorphic, the dorsal ones green, spreading, the ventral ones pale green to hyaline, ascending; megasporangia in two ventral rows, or strobili wholly megasporangiate; microsporangia in two dorsal rows, or strobili wholly microsporangiate; megaspores orange, with a well developed equatorial flange, reticulate to reticulate-rugulate with high, dense ridges, 250–265 µm diam.; microspores orange.A
Forma de vida
Epipétrica, TerrestreA
Ejemplar revisado
Chis (Purpus 6720, BM, F, GH, M, NY, UC). Col (McVaugh 16097A, US). Gro (Lorea 1656b, NY). Hgo (Breedlove 59427, CAS, NY). Jal (Pringle 2593, BM, BR, DS, E, F, K, LL, NY, P, UC, US, W). Méx (Tejero Díez 2233, TEX). Mich (King & Soderstrom 4746, NY, TEX, UC, US). Mor (Rose & Painter 6943, BM, US). Nay (Yatskievych & Beetle 81-347, ARIZ). Oax (Mickel 3748, NY, UC). Pue (Orcutt 4035, BM, DS, GH, K, MEXU). Sin (Breedlove 35686, CAS, MICH, MO). Son (Gentry et al. 19317, NY, US). Ver (Purpus 7438, GH, NY, UC, US).A
Elevación
750 – 2500 mA
Ecología y Hábitat
On moist banks and on wet mossy rocks in or near waterfalls, streams, roadside banks,
or forest clearings, mostly in humid forests.A
or forest clearings, mostly in humid forests.A
Tipo de vegetación
Bosque de neblina/mesófilo, Bosque de pino-encino, Bosque de otro tipoB
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
En peligro de extinción (P)D
Discusión taxonómica
Selaginella porphyrospora is distinguished by flagelliform stems, primary branches, and tips of strobili, which typically produce round buds distally. It is probably sister to S. bernoullii (which see for discussion). Selaginella popayanensis also has hispid lateral leaves, but can be distinguished from S. porphyrospora by its lack of conspicuous idioblasts on the upper surface of the lateral leaves, light orange microspores, and acute lateral leaves.
The microsporangia of S. porphyrospora, with microspores included, have a distinct raspberry color, hence the species epithet.
As previously reported (Alston, 1955), some specimens of S. porphyrospora lack conspicuous idioblasts and/or conspicuous hairs on the upper surface. For the most part, these specimens are easily distinguished by the other characteristics here mentioned.
A
The microsporangia of S. porphyrospora, with microspores included, have a distinct raspberry color, hence the species epithet.
As previously reported (Alston, 1955), some specimens of S. porphyrospora lack conspicuous idioblasts and/or conspicuous hairs on the upper surface. For the most part, these specimens are easily distinguished by the other characteristics here mentioned.
A