Lellingeria labiakii Sundue
Descripción
Diagnosis—Differs from all other species of Lellingeria by having elongate and distally falcate pinnae with bases that are obliquely attached to the rachis, and cretaceous hydathodes.
Rhizome 3–4 mm wide, dorsiventral with leaves arranged along the dorsal side; rhizome scales 2.5 × 0.5 mm, lanceolate, clathrate, the cell wall castaneous, the cell lumens clear or partially occluded, the margins ciliate, the cilia 0.2 mm long, hyaline, straight or tortuous; petiole 0.5–0.8 mm wide, slender, sparsely provided with minute hyaline branched hairs, 0.1 mm long, the hairs 1–2-forked, the branches acicular, also provided with simple hyaline trichomidia, 0.1 mm long; rachis with blackish sclerenchyma clearly visible on both sides of the leaf, provided with sparse indument like that of the petiole on both sides; leaves 15–45 × 2.5–7 cm, pendent, 1-pinnatisect with up to ca. 50 segments, the base of the lamina gradually reduced, the proximal 3–8 segments reduced to auricles, the lamina apex acute; pinnae 1.2–6 cm long, narrowly triangular, ascending, the longest pinnae falcate, the basiscopic side shortly decurrent, the acroscopic side notched, the base sessile, attached to the rachis obliquely, the apex acute; pinna costae not visible on either side of the lamina; lamina surfaces glabrous; veins not visible on either side of the lamina; hydathodes present, cretaceous; sori round, in 4–20 pairs per segment, very slightly sunken abaxially, slightly raised adaxially, without paraphyses; sporangia glabrous; spores green.
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Rhizome 3–4 mm wide, dorsiventral with leaves arranged along the dorsal side; rhizome scales 2.5 × 0.5 mm, lanceolate, clathrate, the cell wall castaneous, the cell lumens clear or partially occluded, the margins ciliate, the cilia 0.2 mm long, hyaline, straight or tortuous; petiole 0.5–0.8 mm wide, slender, sparsely provided with minute hyaline branched hairs, 0.1 mm long, the hairs 1–2-forked, the branches acicular, also provided with simple hyaline trichomidia, 0.1 mm long; rachis with blackish sclerenchyma clearly visible on both sides of the leaf, provided with sparse indument like that of the petiole on both sides; leaves 15–45 × 2.5–7 cm, pendent, 1-pinnatisect with up to ca. 50 segments, the base of the lamina gradually reduced, the proximal 3–8 segments reduced to auricles, the lamina apex acute; pinnae 1.2–6 cm long, narrowly triangular, ascending, the longest pinnae falcate, the basiscopic side shortly decurrent, the acroscopic side notched, the base sessile, attached to the rachis obliquely, the apex acute; pinna costae not visible on either side of the lamina; lamina surfaces glabrous; veins not visible on either side of the lamina; hydathodes present, cretaceous; sori round, in 4–20 pairs per segment, very slightly sunken abaxially, slightly raised adaxially, without paraphyses; sporangia glabrous; spores green.
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Forma de vida
Epipétrica.A
Ejemplar revisado
Oaxaca: Distro. Ixtlán, Mun. Comaltepec, Rt. 175 between Oaxaca-Tuxtepec, along logging road serving the cascadas of Comaltepec that departs from the main rd at Km 103, on rocks in small stream past the second waterfall along the road, 17° 35′ 04″ N, 96° 29′ 37″ W, 2570 m, 16 Mar 2015, M. Sundue, et al. 3970 (MEXU, UC, VT).A
Distribución
México (país): Oaxaca EndémicoA
Elevación
2500 mA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
The new species is supported as a member of Lellingeria by the acicular hair cells that appear upon the rhizome scales and as part of the 1-furcate 3-celled hairs on the leaves. The lack of setae and the veins terminating in hydathodes are also diagnostic of the genus (Labiak et al. 2010). An unusual character displayed by L. labiakii is the oblique pinna base where the acroscopic side of the pinna attaches more towards the adaxial side of the rachis and the basiscopic side attaches more towards the abaxial side of the rachis. Other species of Lellingeria that exhibit this are L. barbensis (Lellinger) A. R. Sm. & R. C. Moran, L. flexibilis Labiak, L. pendulina A. R. Sm. & R. C. Moran, L. pseudocapillaris (Rosenst.) A. R. Sm. & R. C. Moran, and L. tmesipteris (Copel.) A. R. Sm. & R. C. Moran (Labiak 2013). Of these, only L. pseudocapillaris has been included in a phylogenetic analysis, and it is not clear whether these taxa form a clade (Labiak et al. 2010). Nonetheless, L. labiakii differs from all of these in having elongate and distally falcate pinnae and cretaceous hydathodes. The only other species of Lellingeria in Mexico, L. apiculata (Kunze ex Klotzsch) A. R. Sm. & R. C. Moran, has smaller leaves with shorter spreading pinnae and occurs at lower elevations, 1,150–1,600 m (Mickel and Smith 2004).
Etymology—This species is named in honor of Paulo Labiak in recognition of his many contributions to fern systematics. Paulo´s recent monograph of Lellingeria (Labiak 2013) provided the foundation from which this new species could be described.A
Etymology—This species is named in honor of Paulo Labiak in recognition of his many contributions to fern systematics. Paulo´s recent monograph of Lellingeria (Labiak 2013) provided the foundation from which this new species could be described.A