The Collaborative International Dictionary of English v.0.48:

phyllome \phyl"lome\ (f[i^]l"l[=o]m), n. [Gr. fy`llwma foliage,
   fr. fy`llon a leaf.] (Bot.)
   A foliar part of a plant; any organ homologous with a leaf,
   or produced by metamorphosis of a leaf.
   [1913 Webster]