Pleopeltis microgrammoides (Mickel & A.R.Sm.) A.R.Sm. & Tejero
Descripción
Rhizomes creeping, glaucous, 2–3 mm diam.; rhizome scales concolorous orange-brown, lanceolate, minutely denticulate along attenuate tips, appressed, 4 X 1.5 mm; fronds 6–13 cm long, distant, coriaceous; stipes 1⁄6–1⁄5 the frond length, castaneous, glabrous; blades simple, narrowly elliptic, entire (but minutely and regularly notched along margins, which are thickened and slightly revolute), 0.7–1 cm wide, strongly coriaceous, bases attenuate, apices acute; abaxial blade surfaces with scattered round to lanceolate, orange to tan scales, each with dark center and pale margins, becoming whitish with age; adaxial blade surfaces glabrous; venation obscure, anastomosing, veins ending near blade margins in conspicuous pits (hydathodes); sori round to slightly oblong, to 3 mm diam., medial, one row on each side of midrib, lacking scales in the sori but with a few larger scales slightly enveloping young sori at their periphery; sporangia glabrous.A
Ejemplar revisado
(Related to the synonym Polypodium microgrammoides) Known only from the type collection. Gto (Carranza et al. 4320, UC).A
Distribución
México (país) EndémicoA
Elevación
2250 – 2500 mA
Ecología y Hábitat
On rocks on hillside.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
(In relation to the synonym) Polypodium microgrammoides differs from P. muenchii, heretofore the sole member of the segregate genus Microphlebodium, primarily by the simple blades. The distribution of P. muenchii is in southern Mexico (Oaxaca and Chiapas), Guatemala, Honduras, and El Salvador. From Microgramma nitida (J. Sm.) A. R. Sm., which it resembles in the simple blades and creeping rhizomes, P. microgrammoides differs by the glaucous rhizomes beneath the scales (as in P. muenchii); the monomorphic (vs. dimorphic) blades; the broadly ovate, bright orangish brown, concolorous rhizome scales (similar to P. muenchii); longer stipes, to ca. 3 cm (vs. stipes absent or to ca. 0.5 cm); the lack of hair-like scales in the sori; prominent hydathodes adaxially; notched (vs. entire) blade margins; more numerous and ovate (vs. lanceolate to filiform) scales; more obscure venation (veins not at all or only faintly visible in P. microgrammoides, usually readily visible adaxially and sometimes abaxially in M. nitida, and the petioles and midribs at the base of the blades dark purplish brown, exactly as in P. muenchii but unlike M. nitida. Polypodium microgrammoides also grows at much higher elevations than does M. nitida (0–900 m), which has not been found in Guanajuato.
Polypodium muenchii also has notched pinna margins and prominent hydathodes, as in P. microgrammoides, and the two species are closely allied.A
Polypodium muenchii also has notched pinna margins and prominent hydathodes, as in P. microgrammoides, and the two species are closely allied.A