Ctenitis mexicana A.R.Sm.
Descripción
A C. equestri var. erosa indusiis carentibus, paleis planioribus et pallidioribus (stramineis et non clathratis praeter basaliter) costarum, venis adaxialiter ante marginas segmentorum terminantibus differt. (Latinization of the adjectival form of Mexico, where the species is restricted.)
Rhizomes unknown, probably erect, stout; fronds large, to 200 cm long; stipes tan to brown, ca. 1⁄3–1⁄2 the frond length, 30–50+ cm X 5–8 mm, bases with dense brown scales 5–12 X 0.5–1 mm, above the bases sparsely to moderately scaly, the scales ovate, appressed, 0.5–2 mm long, non-clathrate; blades green, deltate, mostly 3–4 pinnate-pinnatifid proximally, 2–3-pinnatepinnatifid distally, to 100+ X 60+ cm; rachises abaxially with scales similar to those of stipes but shorter, especially concentrated at pinna bases; pinnae ca. 15 pairs, proximal pair the largest, stalked to ca. 5 cm, to 50 X 30 cm, inequilaterally deltate, pinnules much more developed basiscopically, pinnules pinnate, pinnulets pinnate to pinnatifid; segments entire, acute at tips, margins with minute scattered hairs 0.1–0.15 mm; veins simple or forked, ending well before the margins; indument on costae and costules abaxially of scattered, appressed, stramineous, nonclathrate (or weakly clathrate at center-base), not iridescent, ovate to ovate-lanceolate, flat scales 0.5–0.15 X 0.3–0.8 mm, also with a few jointed hairs 0.1–0.2 mm long; laminae between veins glabrous on both sides, or abaxially with appressed glandular hairs 0.1–0.2 mm; sori medial, exindusiate.A
Rhizomes unknown, probably erect, stout; fronds large, to 200 cm long; stipes tan to brown, ca. 1⁄3–1⁄2 the frond length, 30–50+ cm X 5–8 mm, bases with dense brown scales 5–12 X 0.5–1 mm, above the bases sparsely to moderately scaly, the scales ovate, appressed, 0.5–2 mm long, non-clathrate; blades green, deltate, mostly 3–4 pinnate-pinnatifid proximally, 2–3-pinnatepinnatifid distally, to 100+ X 60+ cm; rachises abaxially with scales similar to those of stipes but shorter, especially concentrated at pinna bases; pinnae ca. 15 pairs, proximal pair the largest, stalked to ca. 5 cm, to 50 X 30 cm, inequilaterally deltate, pinnules much more developed basiscopically, pinnules pinnate, pinnulets pinnate to pinnatifid; segments entire, acute at tips, margins with minute scattered hairs 0.1–0.15 mm; veins simple or forked, ending well before the margins; indument on costae and costules abaxially of scattered, appressed, stramineous, nonclathrate (or weakly clathrate at center-base), not iridescent, ovate to ovate-lanceolate, flat scales 0.5–0.15 X 0.3–0.8 mm, also with a few jointed hairs 0.1–0.2 mm long; laminae between veins glabrous on both sides, or abaxially with appressed glandular hairs 0.1–0.2 mm; sori medial, exindusiate.A
Forma de vida
TerrestreA
Ejemplar revisado
Pue (Ventura A. 496, CHAPA, ENCB, IEB, MEXU, NY, XAL). Qro (Rzedowski 46577, IEB, UC). Ver (Ballesteros & Ballesteros 356, XAL; Sousa 3494, CAS).
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Elevación
600 – 1800 mA
Tipo de vegetación
Bosque de neblina/mesófilo, Selva altaA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Ctenitis mexicana is most similar to C. equestris in size and dissection of blades, and in having minute hairs along segment margins, but is distinguished by the absence of indusia, flatter, lighter colored (stramineous and non-clathrate, except in basal portion) scales on the costae and costules abaxially, and veins ending well before the segment margins (as seen adaxially).
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