The Fern Bulletin — Volume 1 (1893…
“ The fertile fronds grow almost vertically and are two or three times as long as the sterile ones which are simply ascending. The fertile fronds no doubt grow this way because it is more important for the preservation and increase of the species that the spore-bearing parts of the plant should receive every advantage due to better light, more air, etc., than than the sterile fronds should avail themselves of such advantages. ”
