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The Collaborative International Dictionary
Microsporangium

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.

Wiktionary
microsporangium

n. (context botany English) A case, capsule or container that holds microspores.

WordNet
microsporangium
  1. n. a plant structure that produces microspores

  2. [also: microsporangia (pl)]

Wikipedia
Microsporangium