microsporangium

from WordNet (r) 3.0 (2006)

microsporangium
    n 1: a plant structure that produces microspores

from The Collaborative International Dictionary of English v.0.48

Microsporangium \Mi`cro*spo*ran"gi*um\, n. [NL. See {Micro-},
   and {Sporangium}.] (Bot.)
   A sporangium or conceptacle containing only very minute
   spores. Cf. {Macrosporangium}.
   [1913 Webster]