The Collaborative International Dictionary of English v.0.48:

Hysterophyte \Hys*ter"o*phyte\, n. [Gr. "y`steros following +
   fyto`n plant.] (Bot.)
   A plant, like the fungus, which lives on dead or living
   organic matter. -- Hys`ter*oph"y*tal, a.
   [1913 Webster]