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Asplenium × wherryi
''Asplenium × wherryi'', known as Wherry's spleenwort, is a rare hybrid fern of the Appalachian Mountains. The sterile triploid offspring of mountain spleenwort (''A. montanum'') and Bradley's spleenwort (''A. bradleyi''), it is known from a few sites where those species grow together. First collected by Edgar T. Wherry in 1935, it was largely ignored until a new colony was found in 1961, and the species was named in his honor.
==Description==
''Asplenium × wherryi'' is a small, evergreen fern. The fronds are monomorphic, showing little or no difference between sterile and fertile fronds. The dark-colored stipe (the stem below the leaf blade) is up to long, while the rachis (the central axis of the leaf) is green. The leaf blades are lance-shaped, cut into ten to sixteen pairs of pinnae. The leaf blades are bipinnate at the base (with pinnae fully cut into pinnules), becoming pinnate-pinnatifid (with lobed pinnae) in the middle of the blade and merely pinnatifid (cut only to lobes) near the tip. The spores are abortive and the species is presumed to be triploid.
In general, ''A. × wherryi'' is intermediate in form between its two parents. The dark color is present throughout the stipe of ''A. × wherryi''; in ''A. bradleyi'', the dark color extends well into the rachis, while in ''A. montanum'', only the base of the stipe is dark. The blade of ''A. × wherryi'' is lance-shaped; that of ''A. bradleyi'' is more narrowly so, while that of ''A. montanum'' is more triangular. The cutting of the blade is also intermediate between the parents, resembling the bipinnate (or more deeply cut) ''A. montanum'' at the base and the pinnate-pinnatifid ''A. bradleyi'' higher in the leaf.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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