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a plant organ in which spores are formed. A sporangium may be unicellular (in many lower plants) or...

the multicellular organ of heterosporous Pteridophyta and seed plants in which the microspores...

a layer (occasionally several layers) of cells in the sporangia of the majority of higher plants;...

(n.) A sporangium or conceptacle containing only very minute spores. Cf. Macrosporangium.

(a.) Having the sporangium destitute of a ring; -- said of certain genera of ferns.