• WordNet 3.6
    • n Dicksonia tree ferns of temperate Australasia having bipinnatifid or tripinnatifid fronds and usually marginal sori; in some classification systems placed in family Cyatheaceae
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Century Dictionary and Cyclopedia
    • n Dicksonia A genus of ferns having large, much-divided fronds, and small sori placed close to the margin of the frond at the apex of a vein. The sorus consists of an elevated globular receptacle bearing the sporangia, and inclosed by the cup-shaped indusium. The latter is open at the top, and partly adherent at the outer side to a reflexed toothlet of the frond. The number of species known is over 40, and about half of them are tree-ferns. An Australian species, Dicksonia antarctica, is one of the most ornamental tree-ferns in cultivation. Most of the species are confined to tropical America and Polynesia; but a few occur in the southern parts of the north temperate zone, and one, D. pilosiuscula, is common in eastern North America, and extends as far north as Canada.
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In literature:

Dicksonia and Polypodium Wallichianum continue.
"Journals of Travels in Assam, Burma, Bhootan, Afghanistan and TheNeighbouring Countries" by William Griffith
Dicksonia has a pretty leaf of fretwork, and will grow three feet in length, though it is usually much shorter.
"The Garden, You, and I" by Mabel Osgood Wright
At intervals roaring torrents rush down gullies overgrown with tree-ferns, and full of dicksonia-antarcticas and alsophilas.
"The Last Voyage" by Lady (Annie Allnutt) Brassey