Lomariopsis mexicana Holttum

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Lomariopsis mexicana Holttum

Descripción

Rhizome scales stramineous to pale, lustrous, margins ciliate; stipes 5–15 cm long, 1⁄4–1⁄3 the frond length, stramineous to brown, scaly; sterile blades lanceolate, 30–60 X 12–20 cm, proximal 1–3 pinna pairs somewhat reduced (to ca. 2⁄3 of longest pinnae); rachises slightly alate; pinnae 12–15 pairs, 6–10 X 1.5–2.5 cm, rounded to broadly cuneate at bases, apices abruptly acuminate, margins entire to crenulate; fertile fronds with 12–15 pinna pairs, pinnae 12–13 X 0.3–0.4 cm.A

Forma de crecimiento

Hierba

Forma de vida

Hemiepiphytic. -no state-A

Nutrición

Autotrófica

Ejemplar revisado

Chis (Breedlove 22473, 34075, DS; Palacios-Rios 2819, CHAPA, IEB). Hgo (Hahn 56, P). Oax (Cruden 1114, UC; Mickel 6395, ENCB, NY, UC). Tab (Rovirosa 469, NY). Ver (Sohmer 9460, MEXU; Vázquez T. 2561, CHAPA, NY).A

Distribución

México (país) EndémicoA

Elevación

100 – 750 mA

Tipo de vegetación

Selva altaA

Categoría IUCN

No incluidaB

Categoría NOM-059-SEMARNAT-2010

No incluidaC

Estatus del taxón

(A) Como definida actualmente, probablemente una entidad natural (monofilética)

Discusión taxonómica

This taxon, first mentioned by Underwood (1906) and named by Holttum (1940), is somewhat intermediate between L. vestita and L. recurvata, and Smith (1981) postulated that this poorly known species might be a hybrid. In characters of both the sterile and fertile blades it is intermediate in most characteristics (e.g., pinna base, sterile blade base, dimensions of fertile pinnae). However, the spores of the type fragment and other specimens examined (Cruden 1114, Vázquez T. 2561) appear well formed and are highly ornamented and cristate (cf. R. M. Tryon & A. F. Tryon, 1982: 611).
Moran (in Davidse et al., 1995: 284; 2000) synonymized L. mexicana under L. recurvata, but to us they seem adequately distinct. Because of its morphological intermediacy between L. recurvata and L. vestita, the possibility that it was formed through hybridization should be investigated.
A

Bibliografía

A. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88
B. IUCN 2022: The IUCN Red List of Threatened Species. Versión 2022-2
C. SEMARNAT 2019: MODIFICACIÓN del Anexo Normativo III, Lista de especies en riesgo de la Norma Oficial Mexicana NOM-059-SEMARNAT-2010: 101 pp. – https://www.dof.gob.mx/nota_detalle.php?codigo=5578808&fecha=14/11/2019#gsc.tab=0 [accessed 2023-05-04 06:16]