Amauropelta scalaris (Christ) Á.Löve & D.Löve
Descripción
Rhizomes suberect to erect; fronds to mostly 50–100(–200) cm long; stipes to ca. 8 cm X 2–3 mm, with densely short-hairy scales at bases; blades chartaceous, 45–90 cm long, with 7–11 pairs of gradually reduced proximal pinnae, lowermost auriculiform, ca. 5 mm long, buds often present in axil(s) of distal pinnae; pinnae to 45 pairs, the largest 6–16 X 1.1–2.6 cm, incised to ca. 1 mm from costae, subopposite, horizontal; aerophores absent; segments 2–4 mm wide, mostly rounded at tips, perpendicular or slightly oblique to costae; veins 9–12 pairs per segment; indument abaxially of scattered to dense hairs 0.1–0.3 mm long on rachises, costae, and veins, tissue between veins eglandulose, with erect hamate hairs to 0.3 mm long, adaxially with scattered to dense appressed hairs 0.1 mm long between veins; sori supramedial, with small stramineous to tan indusia, margins hamatehairy; sporangia glabrous; 2n=58 (Oax, CR).A
Forma de vida
TerrestreA
Ejemplar revisado
(Related to the synonym Thelypteris scalaris) Chis (Chater 160, MEXU, MO; Martínez S. 17614, UAMIZ). Hgo (Bartholomew 3413, CAS; Luna et al. 765, FCME). Oax (Croat 47991, UC; Rzedowski 32816, ENCB). Pue (Zelaya 19, UAMIZ). Ver (Ventura A. 15138, ENCB, MO).A
Elevación
600 – 2200 mA
Ecología y Hábitat
In wet forests, especially along trails and streams.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
(In relation to the synonym) Thelypteris scalaris is distinguished by the combination of hamate hairs on the indusia and tissue between veins abaxially, numerous (7–11) pairs of gradually reduced proximal pinnae, and blades adaxially with short, adpressed, acicular hairs. It is similar and closely related to T. melanochlaena, which see for differences. Eleven of sixteen collections seen from Oaxaca bear a small bud in the axil of a distal pinna, as does the sole collection from Puebla. The gemmiferous collections also have shorter and denser hairs on the costae abaxially. A few specimens seem to be exindusiate, e.g., Rámirez & Riba 667 (XAL), from Hidalgo. Chater 160, from Chiapas, has unusually long fronds to 200 cm and long pinnae.
Three collections from the vicinity of Cerro Tres Picos in Chiapas (Breedlove 25404, 34386, 34434, DS) differ from typical forms in having more oblique pinna segments, denser hairs on the costae abaxially, longer, more spreading, and less hairy rhizome scales, broader and more abruptly reduced blades proximally with fewer pairs of reduced pinnae, and larger, more prominently green indusia. These specimens probably represent a distinct variety or perhaps a different species.A
Three collections from the vicinity of Cerro Tres Picos in Chiapas (Breedlove 25404, 34386, 34434, DS) differ from typical forms in having more oblique pinna segments, denser hairs on the costae abaxially, longer, more spreading, and less hairy rhizome scales, broader and more abruptly reduced blades proximally with fewer pairs of reduced pinnae, and larger, more prominently green indusia. These specimens probably represent a distinct variety or perhaps a different species.A