The Collaborative International Dictionary of English v.0.48:

Peronate \Per"o*nate\, a. [L. peronatus rough-booted, fr. pero,
   -onis, a kind of rough boot.] (Bot.)
   A term applied to the stipes or stalks of certain fungi which
   are covered with a woolly substance which at length becomes
   powdery. --Henslow.
   [1913 Webster]