Asplenium septentrionale (L.) Hoffm.

Primary tabs

Asplenium septentrionale (L.) Hoffm.

Descripción

Roots filamentous, wiry, not proliferous; rhizomes erect, much branched to produce many-stemmed tufts or mats bearing numerous crowded fronds; rhizome scales dark reddish brown to black, clathrate, 2–4 X 0.2–0.4 mm, entire; fronds clumped, 2–12 cm long; stipes dark reddish brown proximally, greenish distally, dull, 2–11 cm X 0.2–0.3 mm, 2⁄3–9⁄10 of frond length, glabrous, not alate but with two thickened adaxial ridges; blades thick-herbaceous, linear, simple to 1-forked or lacerate at the tips, occasionally 1-pinnate with a single lateral pinna, mostly 0.5–2.5 X 0.1–0.2 cm for unforked blades, to 1 cm if the single pinna strongly diverges, glabrous, bases acute, apices acute, not rooting at tips; rachises green, dull, glabrous; pinnae commonly none or one per frond and then strongly ascending, linear, 5–10 X 0.75–2 mm, apices acute, margins entire to remotely lacerate; veins 1-forked or absent except for main midrib, obscure, tips not evident adaxially; indument not seen, blades appearing glabrous; sori usually 2+ per pinna, parallel to margins and facing each other; indusia whitish to tan, mostly 5–20 X 0.5 mm, margins entire to subentire; spores reniform, 64 per sporangium; 2n=144 (Europe).A

Forma de crecimiento

Hierba

Forma de vida

Epipétrica.

Nutrición

Autotrófica

Ejemplar revisado

BCN (Brandegee s.n., 18 May 1893, DS, NY, UC, US; Moran & Thorne 14343, ENCB).A

Distribución

Asia PresenteA, Europa PresenteA, México (país) Nativo y no endémicoA, Norteamérica al N de México PresenteA

Elevación

2200 – 3050 mA

Ecología y Hábitat

In volcanic and granitic rock crevices.A

Tipo de vegetación

No especificado

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

Two subspecies are recognized in Europe (Reichstein, 1981); ours is subsp. septentrionale. Asplenium septentrionale is easily distinguished from all other spleenworts in Mexico by the linear, grass-like or distally 1-forked blades, with blade segments (or occasionally pinnae) only ca. 1–2 mm wide. Farther north in the range, in California, this rare species grows in holes or crevices of volcanic boulders, and that also appears to be the favored habitat in the Sierra San Pedro Mártir, the only area where it is known in Mexico.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]