Asplenium trichomanes L.
Descripción
Roots filamentous, wiry, not proliferous; rhizomes shortcreeping to erect; rhizome scales blackish, clathrate or with central black band and clathrate edges, lumina very small, 1.5–2.5 X 0.1–0.3 mm, entire; fronds clumped, 7–20 cm long; stipes castaneous to atropurpureous, lustrous, 1–4 cm X 0.5–0.8 mm, 1⁄6–1⁄4 the blade length, glabrous, with tan inconspicuous adaxial wings ≤ 0.1 mm wide; blades chartaceous, narrowly linearoblong, 1-pinnate, 6–15 cm X 4–10 mm, bases slightly narrowed, apices confluent, not proliferous; rachises castaneous, lustrous, glabrous, adaxially with tan wings 0.1–0.2 mm wide; pinnae short-oblong, 10–20(–30) pairs, 4–7 X 1–4 mm, stalked to 1 mm, ultimately articulate, dimidiate, apices rounded, margins entire to slightly crenulate, sometimes revolute; veins 1-forked, tips not evident adaxially; indument abaxially absent, blades glabrous; sori 2–5 pairs per pinna, on both sides of midveins, occasionally diplazioid; indusia 0.5–1.5 X 0.2–0.4 mm, margins entire to suberose; spores reniform; 2n=72, 144 (USA).A
Ejemplar revisado
Chih (LeSueur 1130, US).A
Elevación
2500 mA
Ecología y Hábitat
In sheltered crevices of ledges and cliffs.A
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
Presumably, the Mexican specimens are subsp. trichomanes, the diploid cytotype (thus agreeing with specimens from southwestern United States). Tetraploid plants, subsp. Quadrivalens D. E. Meyer, are generally more northern in distribution and grow on calcareous (vs. acidic) substrates. Other subspecies, with hexaploid number of chromosomes, are known from Madeira and New Zealand.
Asplenium trichomanes is most similar to A. palmeri in Mexico, differing from that in the nonproliferous blades.
A
Asplenium trichomanes is most similar to A. palmeri in Mexico, differing from that in the nonproliferous blades.
A