The Collaborative International Dictionary of English v.0.48:

Gleba \Gle"ba\, n.; pl. Gleb[ae]. [L., a clod.] (Bot.)
   The chambered sporogenous tissue forming the central mass of
   the sporophore in puff balls, stinkhorns, etc.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

gleba
    n 1: fleshy spore-bearing inner mass of e.g. a puffball or
         stinkhorn