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macrosporangium
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- Macrosporangium - n. - 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.
- Oophoridium - n. - The macrosporangium or case for the larger kind of spores in heterosporous flowerless plants.