Lygodium venustum Sw.
Descripción
Rhizomes short-creeping, 1–2 mm diam., hairs brown; stipes and rachises stramineous, wiry; axes glabrescent to densely hairy with short stiff hairs; pinna axes very short; pinnule axes pinnate, the segments alternating, each segment trifid to quinquifid, the central lobe much the largest, 3–10 X 0.5–1.4 cm, margins finely serrulate; veins free, sparsely strigose to densely hairy, hairs 0.5 mm long, whitish; fertile lobes ca. 1 mm wide, indusia with many 0.5 mm long white hairs; 2n=116 (Trin).A
Ejemplar revisado
Ags (Siqueiros D. 2367, IEB). Camp (Lundell 1415, NY). Chis (Breedlove 26554, NY). Col (McVaugh 15669, NY). Gro (Hinton 10794, NY). Hgo (Clark 6850, NY). Jal (McVaugh 25536, NY). Méx (Hinton 7392, NY). Mich (King & Soderstrom 4952, NY). Nay (Rose 14309, NY). Oax (Mexia 9184, NY). Pue (Boege 430, MEXU). QR (Boom 282, NY). Qro (Carranza 1220, MEXU). Sin (González Ortega 4812, NY). SLP (Pringle 3318, MEXU). Tab (Cowan 1732, NY). Tam (Clark 7424, NY). Ver (Ventura A. 8184, NY). Yuc (Lundell 4843, MO).A
Nombre común
Bejuco chino, chiman, crispillo, culebrina, hierba de conversación, hierba de la cuerdilla, hierba de la víbora, nido de papas, papantepazole, tepantepazole.B
Elevación
0 – 900(– 1300) mA
Ecología y Hábitat
Scrubby open areas of low elevations.A
Tipo de vegetación
Bosque de neblina/mesófilo, Bosque de encino, Selva baja, Selva medianaB
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
Lygodium venustum is easily distinguished from L. heterodoxum by its free veins, pubescent laminae, and palmately 3–5-parted pinnules. Mexican specimens have often been named L. mexicanum and L. polymorphum (Cav.) Kunth, based on degree of pubescence, but these variants are merely part of the wide variation in this species. The name L. polymorphum is probably misapplied to this species; the type is from the Philippines, fide Christensen (Dansk. Bot. Ark. 9(3): 3–32. 1937), and probably referable to L. flexuosum (L.) Sw. In any case, L. polymorphum is illegitimate, since Cavanilles cited Ophioglossum scandens L. as a synonym (see Alston & Holttum, Reinwardtia 5: 15. 1959).
A putative hybrid of L. heterodoxum and L. venustum, with malformed spores, was collected in Oaxaca (Mickel 4179, NY). It has some free and some anastomosing veins, fertile lobes with associated whitish hairs, pinnules of intermediate width (11–14 mm wide), pinnule axes flexuous, and inequilaterally 2–4 palmately lobed pinnules.
A
A putative hybrid of L. heterodoxum and L. venustum, with malformed spores, was collected in Oaxaca (Mickel 4179, NY). It has some free and some anastomosing veins, fertile lobes with associated whitish hairs, pinnules of intermediate width (11–14 mm wide), pinnule axes flexuous, and inequilaterally 2–4 palmately lobed pinnules.
A