Mildella Trevis.
Descripción
Rhizomes short- to long-creeping, short-ascending, with bicolorous scales; fronds small, clumped, monomorphic; stipes stramineous, reddish brown or black, adaxially grooved, lustrous, glabrous except for clavate hairs adaxially; blades pinnate-pinnatifid to bipinnate, proximal pinnae basiscopically exaggerated, laminae subcoriaceous; veins free, simple or forked; sori essentially marginal, indusia just back from margin (inframarginal), recurved, entire, erose or ciliate; spores roughened; x=30.A
Forma de vida
Rupícola, TerrestreA
Distribución
México (país) Nativo y no endémicoA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Mildella, as usually construed, comprises a genus of nine species, six of southern and eastern Asia, one in Haiti, and two widespread in Mexico and Central America at middle elevations, in mesic habitats.
The false margins projecting beyond the false indusia distinguish Mildella. The genus is doubtfully distinct from Cheilanthes. Molecular data show Mildella to be nested within Cheilanthes (Gastony & Rollo, 1995) and also that Mildella sensu Hall and Lellinger (1967) is polyphyletic (Cranfill, unpubl.) with the Asian species belonging to Aleuritopteris. New World species are probably related to the Cheilanthes angustifolia complex, having distinct hydathodes, prominulous veins, and grooved rachises and stipes, but the stipes and rachises in Mildella are hirsute adaxially (vs. glabrous in C. angustifolia and allies).
A
The false margins projecting beyond the false indusia distinguish Mildella. The genus is doubtfully distinct from Cheilanthes. Molecular data show Mildella to be nested within Cheilanthes (Gastony & Rollo, 1995) and also that Mildella sensu Hall and Lellinger (1967) is polyphyletic (Cranfill, unpubl.) with the Asian species belonging to Aleuritopteris. New World species are probably related to the Cheilanthes angustifolia complex, having distinct hydathodes, prominulous veins, and grooved rachises and stipes, but the stipes and rachises in Mildella are hirsute adaxially (vs. glabrous in C. angustifolia and allies).
A