Amauropelta venturae (A.R.Sm.) Salino & T.E.Almeida
Descripción
A T. melanochlaena indusiis pallide brunneolis (vs. denigratis), pilis hamatis in laminis carentibus, tantum 3–4 paribus pinnarum proximalium abrupte reductis differt; a T. scalari pilis hamatis in laminis carentibus, tantum 3–4 paribus pinnarum proximalium abrupte reductis differt; a T. concinna, qua pubescentia similiter brevi in rhachidibus et costis habet, sporangiis setulosis carentibus, paribus paucioribus pinnarum proximalium reductis, pilis erectis numerosis in laminis inter venas abaxialiter, pilis numerosis 0.1 mm longis in paginis adaxialibus laminarum differt. (Honoring Francisco Ventura A., avid plant collector in southern Mexico and especially in the state of Veracruz.)
Rhizomes not known, probably suberect; fronds 45–90 cm long; stipes castaneous, 10–15 cm X 1.5–3 mm, with short-hairy scales at bases; blades chartaceous, 35–75 cm long, with 3–5 pairs of abruptly reduced proximal pinnae, lowermost auriculiform, ca. 5–10 mm long, lacking proliferous buds; pinnae 20–26 pairs, the largest 5–12 X 1.6–2.2 cm, subopposite to alternate, incised to ca. 1 mm from costae; aerophores absent; segments 3–4 mm wide, mostly acute at tips, oblique to costae; veins 8–12 pairs per segment; indument abaxially of moderately dense, uniformly short hairs 0.05–0.1 mm long on rachises, costae, and veins, tissue between veins eglandular but with erect hairs 0.05–0.1mm long, adaxially with dense appressed hairs to 0.1 mm long; sori supramedial, with small, tan indusia, these sometimes with a few marginal hairs and minute sessile glands; sporangia glabrous.
A
Rhizomes not known, probably suberect; fronds 45–90 cm long; stipes castaneous, 10–15 cm X 1.5–3 mm, with short-hairy scales at bases; blades chartaceous, 35–75 cm long, with 3–5 pairs of abruptly reduced proximal pinnae, lowermost auriculiform, ca. 5–10 mm long, lacking proliferous buds; pinnae 20–26 pairs, the largest 5–12 X 1.6–2.2 cm, subopposite to alternate, incised to ca. 1 mm from costae; aerophores absent; segments 3–4 mm wide, mostly acute at tips, oblique to costae; veins 8–12 pairs per segment; indument abaxially of moderately dense, uniformly short hairs 0.05–0.1 mm long on rachises, costae, and veins, tissue between veins eglandular but with erect hairs 0.05–0.1mm long, adaxially with dense appressed hairs to 0.1 mm long; sori supramedial, with small, tan indusia, these sometimes with a few marginal hairs and minute sessile glands; sporangia glabrous.
A
Forma de vida
Epipétrica, TerrestreA
Ejemplar revisado
(Related to the synonym Thelypteris venturae) Ver (Ventura A. 8030, ENCB).A
Distribución
México (país) EndémicoA
Elevación
400 – 600 mA
Tipo de vegetación
Selva altaA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
(In relation to the synonym Thelypteris venturae) Specimens of this species were initially determined by Smith, in 1974, as T. aff. melanochlaena. Thelypteris venturae differs from that in having only 3–4 pairs of abruptly reduced proximal pinnae, indument abaxially of straight (non-hamate) hairs, and light tan (rather than blackish) indusia. From T. scalaris, it differs in having uniformly dense short, straight hairs 0.05–0.1 mm long on the axes and blades abaxially (hairs longer, many hamate, in T. scalaris). From T. concinna, which has similar uniformly short pubescence on the rachises and costae abaxially, T. venturae differs in having fewer reduced proximal pinnae, numerous erect hairs on the tissue between veins abaxially, numerous hairs 0.1 mm long on the adaxial surfaces of the blades, and absence of sporangial setulae.A