Gaga monstraparva Fay W.Li & Windham
Descripción
Rhizomes short and compact. Rhizome scales 3–4 mm long, ca. 0.7 mm wide, lanceolate, concolored, lustrous black. Petioles ca. 35 cm long and 2.7 mm in diameter, castaneous, glabrous. Rachises grooved adaxially, with pale ridges on both sides of groove, glabrous. Leaf blades ca. 36 cm long, 16 cm wide; somewhat coriaceous, ovate, 4-pinnate proximally, largest pinnae ca. 15 X 8 cm;pinnae and pinnules with a conform, terminal segment; basal basiscopic pinnules at most 1.5 times longer than acroscopic pinnules. Ultimate segments to 18 X 3 mm, narrowly lanceolate; primary and secondary veins visible both adaxially and abaxially. Pseudoindusia covering half to one-third of the abaxial segment surface; non-decurrent and occasionally discontinuous proximally; margin more or less entire and smooth. Spores unknown. Chromosome number unknown.A
Forma de vida
TerrestreA
Distribución
México (país): México EndémicoA
Elevación
2295 mA
Tipo de vegetación
Bosque de pino-encinoA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Similar to Gaga cuneata but differing in having ovate (vs. lanceolate) leaf blades that are 4-pinnate (vs. 2-pinnatepinnatifid or 3-pinnate) proximally and much longer basal pinnae (15 vs. 3.2–6.5 cm); similar to G. chaerophylla and G. decomposita but differing in having ovate (vs. deltate-pentagonal) leaf blades and basal basiscopic pinnules only slightly longer than the acroscopic pinnules; similar to Gaga angustifolia but differing in having the pseudoindusia predominantly continuous, the segments narrowly lanceolate (vs. linear), and a complete lack of scales on leaf blades.
Our phylogenetic reconstructions suggest that G. monstraparva is a hybrid involving G. cuneata and an unknown diploid from the angustifolia clade. In the plastid dataset, the only accession of G. monstraparva is wellsupported as sister to the three samples of G. cuneata. In the nuclear dataset, G. monstraparva shows two alleles, one minimally divergent from G. cuneata and the other unaffiliated with any of the well-supported groups in the angustifolia clade.
A
Our phylogenetic reconstructions suggest that G. monstraparva is a hybrid involving G. cuneata and an unknown diploid from the angustifolia clade. In the plastid dataset, the only accession of G. monstraparva is wellsupported as sister to the three samples of G. cuneata. In the nuclear dataset, G. monstraparva shows two alleles, one minimally divergent from G. cuneata and the other unaffiliated with any of the well-supported groups in the angustifolia clade.
A