This section is from the book "Commercial Gardening Vol2", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
There are several species in this genus, recognized by the spore clusters being continuous along the copiously netted veins, and also sometimes developed slightly between them. The best market kinds are H. cordata, from India, Ceylon, the Philippines, etc, having simple, entire, heart-shaped, deep-green fronds; and H. palmata, having hairy palmate fronds with oblong crenulate segments. Both kinds are compact in growth, and a limited trade is done in them when grown in small pots.