Asplenium semipinnatum (Hieron.) A.R. Sm.
Descripción
Roots fibrous, not proliferous; rhizomes erect; rhizome scales blackish to dark brown, clathrate, ca. 4 X 0.8 mm, subentire; fronds clumped, to ca. 65 cm long; stipes dark gray-brown, dull, 8–12 cm X 1.5–2.5 mm, ca. 1⁄5 of frond length or less, glabrous except for scattered scales at bases, adaxially with green wings 0.3–0.4 mm wide; blades chartaceous, linear-lanceolate, greatly reduced proximally, 40–50 X 4.5–8 cm, 2-pinnate nearly to the apices, pinnate at apices, rachises terminating in small scaly bud or plantlet with fronds to 4 cm long; rachises brownish, dull, glabrous, with green wings 0.4–0.6 mm wide; pinnae lanceate, 40–50 pairs, 2.5–4 X 0.8–1.3 cm, sessile or stalked to 0.5 mm, the most developed pinnae with to 8 pairs of oval or elliptic pinnules, the pinnules subentire or toothed near the tips, apices rounded to acutish; veins mostly 2–3 pairs in pinnules, tips evident adaxially; indument abaxially of scattered, appressed, tan, clavate hairs 0.1–0.2 mm long; sori 1–5 per pinnule, on both sides of midveins; indusia mostly 1–2.5 X 0.5 mm, margins entire or subentire; spores reniform.A
Forma de vida
TerrestreA
Ejemplar revisado
SLP (Pringle 4074, DS, UC, from the same locality as the type, 4 Dec 1891).A
Distribución
México (Country) endemicB
Tipo de vegetación
Wet montane forestsA
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
This species, newly elevated to species status here, is fully 2-pinnate. Probably it is related to A. sessilifolium, but differs by the 2-pinnate blades and more robust fronds to 65 X 8 cm. Spores of Pringle 4074 have been examined and appear well formed.
From this same locality, Hieronymus described A. potosinum Hieron. var. incisum Hieron. (Hedwigia 60: 247. 1918), based on Pringle 3968 (B!; isotypes ARIZ!, DS!, K!, LE, MEXU!, MO!, NY!–2 sheets, UC!, US!–2 sheets). This is intermediate morphologically between A. semipinnatum and A. sessilifolium and has malformed sporangia and poorly formed or no spores. We regard it as a probable hybrid. Another collection from the same locality is Pringle 3412 (LL). A third collection of the putative hybrid, from Edo. Hidalgo, is Yatskievych 83-131 (ARIZ).
A
From this same locality, Hieronymus described A. potosinum Hieron. var. incisum Hieron. (Hedwigia 60: 247. 1918), based on Pringle 3968 (B!; isotypes ARIZ!, DS!, K!, LE, MEXU!, MO!, NY!–2 sheets, UC!, US!–2 sheets). This is intermediate morphologically between A. semipinnatum and A. sessilifolium and has malformed sporangia and poorly formed or no spores. We regard it as a probable hybrid. Another collection from the same locality is Pringle 3412 (LL). A third collection of the putative hybrid, from Edo. Hidalgo, is Yatskievych 83-131 (ARIZ).
A