Description
The tree ferns are the
ferns that grow with a trunk elevating the
fronds above ground level. Most tree ferns are members of the "core tree ferns", belonging to the families
Dicksoniaceae,
Metaxyaceae, and
Cibotiaceae in the order
Cyatheales. This order is the third group of ferns known to have given rise to tree-like forms. The two others are the
Marattiales, a
eusporangiate order that the extinct
Psaronius evolved from, and the order
Polypodiales where the extinct genus
Tempskya belongs.
Characteristics:
Fern Tree is a medium-sized tree, native to the Western Ghats. Leaves are pinnate, leaflets 6-8 pair, smooth, shining, opposite or some alternate, stalkless, linear oblong, 4-6 inches long, with a prominent midrib. Leaf spine has a leafy wing on either side between the leaflets. Flowers are small, numerous, unisexual, in erect narrow panicles, 6-8 inches long, in leaf axils. Sepals are narrow, smooth, persistent. Petals in male flowers as long as sepals, in female small. Disk is very hairy. Drupe is ovoid, 0.5 inch in diameter, purple shining.
The fronds of tree ferns are usually very large and multiple-
pinnate. Their trunk is actually a vertical and modified
rhizome, and
woody tissue is absent. To add strength, there are deposits of
lignin in the cell walls and the lower part of the stem is reinforced with thick, interlocking mats of tiny roots.
Medicinal Uses:
The decoction of the plant is used in typhoid fever and is also used as an anthelmintic, pectoral, expectorant, tonic, dyspepsia and astringent. Fronds are useful in poulticing swellings16. Powdered stem dissolved in water is used for enema during stomach disorders in children.
Tree-ferns have been cultivated for their beauty alone; a few, however, were of some economic application, chiefly as sources of starch.