Morfología ecológica comparada de las Filicopsidas de las Sierras Australes de Buenos Aires

PONCE, M. M.

San Miguel de Tucumán

Congreso; XVIII Jornadas Argentinas de Botánica; 1981

External characters, like inclínation angle of the frond, blade size, photosynthetic surface and morphological behavior during the dry period, are measured. Internal morphology, like stomata density and size, trichomes density and type, cuticule, epidermal cell walls and blade thickness and palisade-spongy chlorenchyma ratio are also indicated.As these features are assumed to be of adaptative value, because they vary depending on the humidity-dryness condition and pattern of the particular habítat of each species, the data are used to obtain an index called Drought Resistance Index.