Metaxya C.Presl
Descripción
Rhizomes stout, creeping, solenostelic, hairy (scales absent); fronds large, pinnate; costae grooved; veins free, closely parallel, occasionally forked; stomates with 3 subsidiary cells, one on the side of each guard cell and a third on the side of the smaller one; sori dorsal, one to several per vein, round or nearly so, exindusiate; receptacles flat or nearly so; sporangia numerous, maturing together, mixed with copious hairs, pedicel short, of 4 rows of cells; annuli slightly oblique; spores 64 per sporangium, ± globose with a trilete scar, with a granulate perine; x=ca. 94–96.A
Forma de vida
TerrestreA
Distribución
México (país) Nativo y no endémicoA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Metaxya is a genus of two species of the New World tropics. Its affinities are obscure, but it may be most closely related to Lophosoria, both genera being placed in the Cyatheaceae by Tryon (1970). Roy and Holttum (1965) suggested a relationship to Culcita or Thyrsopteris. Molecular data (Wolf et al., 1999; see citation under Lophosoria) show Metaxya to be at the base of the tree fern clade.A