The Collaborative International Dictionary of English v.0.48:

Cladophyll \Clad"o*phyll\, n. [Gr. ? a sprout + ? a leaf.]
   (Bot.)
   A special branch, resembling a leaf, as in the apparent
   foliage of the broom (Ruscus) and of the common cultivated
   smilax (Myrsiphillum).
   [1913 Webster]

WordNet (r) 3.0 (2006):

cladophyll
    n 1: a flattened stem resembling and functioning as a leaf [syn:
         cladode, cladophyll, phylloclad, phylloclade]