This section is from the book "The Standard Cyclopedia Of Horticulture Vol2", by L. H. Bailey. See also: Western Garden Book: More than 8,000 Plants - The Right Plants for Your Climate - Tips from Western Garden Experts.
(Greek, doubled). Polypodiaceae. Rather large, coarse ferns, of greenhouse culture.
Allied to Asplenium, but with the indusia often double, extending along both sides of some of the free veins. The dividing line between Diplazium and Asplenium is technical. In general appearance and in cultural requirements, the two genera are practically identical. - Eighty or more species are found, mostly in the warmer portions of the world.
A. Leaves simple.
Presl. Leaves 6-9 in. long, 3/4-l in. wide, narrowed upward and downward, the margin mostly entire; sori reaching nearer to the edge than the midrib. India, China, Japan.
aa. Leaves pinnate, with the pinnae deeply lobed: rootstock not rising to form a trunk.
Presl (Asplenium arboreum, Linn.). Leaves 12-18 in. long, 6-8 in. wide, with a distinct auricle or lobe at the base. The habit is not arboreous, as originally supposed, and as the name would indicate; quite near the next, but less deeply cut. W. Indies and Venezuela.
Shepherdii, Link (Asplenium Shepherdii, Spreng.). Leaves 12-18 in. long, 6-9 in. broad, deeply lobed, the lobes at the base sometimes reaching down to the rachis, somewhat toothed and often 1/4in. broad; sori long-linear. Cuba and Mex. to Brazil.
aaa. Leaves bipinnate: trunk somewhat arborescent.
C. Chr. (D. latifolium, Moore. Asplenium latifolium, Don). stem erect, somewhat arborescent: leaves 3-4 ft. long, 12-18 in. wide, with about 12 pinnae on either side. India, China and the Philippines.
L. M. Underwood.