Asplenium harrisii Jenman
Descripción
Roots filamentous, wiry, not proliferous; rhizomes erect; rhizome scales bicolorous, center dark, strongly clathrate, margins narrow, lighter, lumina not occluded, 1–2 X 0.5 mm, entire; fronds clumped, to ca. 15 cm long; stipes greenish to tan, dull, usually less than 1.5 cm X 0.5 mm, ca. 1⁄10 of frond length, with occasional red-brown hairs ca. 0.2 mm long and rare red-brown hair-like scales 1.2 X 0.2 mm, adaxially with green wings ca. 0.1–0.2 mm wide; blades membranaceous, 1-pinnate, 7–14 X 1.5 cm, linear, usually with flagelliform apices eventually bearing small buds; rachises greenish, dull, with rare red-brown hairs ca. 0.2 mm and reduced scales 1 or 2 cells wide and 0.2–1 mm long, both hairs and scales with enlarged, darkened apical cells, adaxially with green wings ca. 0.1 mm wide; pinnae dimidiate, medial pinnae oblong to almost round, mostly 15–30 pairs, 3–7 X 2.5–4 mm, short-stalked to 0.5 mm, proximal 3–6 pairs gradually reduced nearly to rhizomes, pinnae similarly shaped but smaller distally, basiscopic sides cuneate and straight, acroscopic bases truncate, rounded at apices, margins of largest pinnae subentire to erose; veins 1- or 2-forked, ca. 3 pairs per pinna, evident on both sides of blades, tips evident adaxially; indument abaxially of scattered tan appressed clavate hairs 0.1–0.2 mm long on blades; sori 1 or 2 pairs per pinna, on both sides of midveins, sori on basiscopic sides ± parallel to lower margins; indusia ca. 1–1.5 X 0.3–0.5 mm, margins erose to entire; spores reniform; 2n=144 (Jam).A
Forma de vida
EpífitaA
Ejemplar revisado
Chis (Breedlove 31750, DS). ?Hgo (Sánchez Mejorada R. 755, MEXU).A
Elevación
2800 mA
Ecología y Hábitat
On tree bases or in rock crevices.A
Tipo de vegetación
Bosque de neblina/mesófiloA
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
The sole specimen from Hidalgo, from Plan del Ayacahuite, El Chico, “creciendo en las grietas de las peñas húmedas,” is scrappy and without blade apices, so the identity is somewhat uncertain. If it is not this species, then it is possibly undescribed.
Asplenium harrisii differs from other very small species in the A. trichomanes group, like A. soleirolioides, in having greenish or brownish, dull stipes and rachises. It is one of only a few other species of Asplenium in Mexico that have flagelliform apices, the others being A. soleirolioides, A. palmeri, and species in the A. radicans group. None of these appears to be closely related.
A
Asplenium harrisii differs from other very small species in the A. trichomanes group, like A. soleirolioides, in having greenish or brownish, dull stipes and rachises. It is one of only a few other species of Asplenium in Mexico that have flagelliform apices, the others being A. soleirolioides, A. palmeri, and species in the A. radicans group. None of these appears to be closely related.
A