pteridomania

from The Collaborative International Dictionary of English v.0.48

Pteridomania \Pter`i*do*ma"ni*a\, n. [Gr. ?, ?, a fern + E.
   mania.]
   A madness, craze, or strong fancy, for ferns. [R.] --C.
   Kingsley.
   [1913 Webster]