The Collaborative International Dictionary of English v.0.48:

Gonimia \Go*nim"i*a\, n. pl. [NL., fr. Gr. ? productive, fr. ?
   that which generates.] (Bot.)
   Bluish green granules which occur in certain lichens, as
   Collema, Peltigera, etc., and which replace the more
   usual gonidia.
   [1913 Webster]