Noun | 1. | family Dicksoniaceae - tree ferns: genera Dicksonia, Cibotium, Culcita, and Thyrsopteris elegans fern family - families of ferns and fern allies Dicksonia, genus Dicksonia - tree ferns of temperate Australasia having bipinnatifid or tripinnatifid fronds and usually marginal sori; in some classification systems placed in family Cyatheaceae Cibotium, genus Cibotium - in some classification systems placed in family Cyatheaceae: ornamental tree ferns with coarse gracefully drooping fronds Culcita, genus Culcita - includes some plants usually placed in e.g. genus Dicksonia: terrestrial ferns resembling bracken; tropical America; Malaysia to Australia and Polynesia; southwestern Europe and Atlantic islands genus Thyrsopteris - one species |