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.
This genus is closely related to Blechnum, but is distinguished from it by having the spore clusters on the margins instead of parallel with or contiguous to the midrib. The best market kinds are L. gibba and L. ciliata. The former has pinnatifid fronds, 1-2 ft. long when full grown, deep green and elegantly waved; while the latter (L. ciliata) has fronds 6-12 in. long, divided almost down to the rachis or midrib, the segments being deeply cleft and with fine teeth-like hair on the margins. Both kinds are natives of New Caledonia, and may be regarded as miniature tree Ferns of quick and easy growth in a warm greenhouse.