Macrosporangium

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Macrosporangium \Mac`ro*spo*ran"gi*um\, n. [NL. See {Macro-},
     and {Sporangium}.] (Bot.)
     A sporangium or conceptacle containing only large spores; --
     opposed to {microsporangium}. Both are found in the genera
     {Selaginella}, {Isoctes}, and {Marsilia}, plants remotely
     allied to ferns.


     [1913 Webster]

From WordNet (r) 2.0 [wn]:

  macrosporangium
       n : a plant structure that produces megaspores [syn: {megasporangium}]
       [also: {macrosporangia} (pl)]