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sporangium
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- Sporangium - n. - A spore case in the cryptogamous plants, as in ferns, etc.
- Pedicel - n. - A slender support of any special organ, as that of a capsule in mosses, an air vesicle in algae, or a sporangium in ferns.
- Microsporangium - n. - A sporangium or conceptacle containing only very minute spores. Cf. Macrosporangium.
- 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.
- Stoma - n. - The line of dehiscence of the sporangium of a fern. It is usually marked by two transversely elongated cells. See Illust. of Sporangium.
- Exannulate - a. - Having the sporangium destitute of a ring; -- said of certain genera of ferns.