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Ovum :: Ovum (n.) A more or less spherical and transparent mass of granular protoplasm, which by a process of multiplication and growth develops into a mass of cells, constituting a new individual like the parent; an egg, spore, germ, or germ cell. See Illust. of Mycropyle..

Exospore :: Exospore (n.) The extreme outer wall of a spore; the epispore.

Spore :: Spore (n.) A minute grain or germ; a small, round or ovoid body, formed in certain organisms, and by germination giving rise to a new organism; as, the reproductive spores of bacteria, etc..

Swart :: Swarmspore (n.) One of the minute flagellate germs produced by the sporulation of a protozoan; -- called also zoospore.

Sporophoric :: Sporophore (n.) That alternately produced form of certain cryptogamous plants, as ferns, mosses, and the like, which is nonsexual, but produces spores in countless numbers. In ferns it is the leafy plant, in mosses the capsule. Cf. Oophore..

Melanosperm :: Melanosperm (n.) An alga of any kind that produces blackish spores, or seed dust. The melanosperms include the rockweeds and all kinds of kelp..

Gemmule :: Gemmule (n.) One of the reproductive spores of algae.

Macrosporic :: Macrosporic (a.) Of or pertaining to macrospores.

Theca :: Theca (n.) A sheath; a case; as, the theca, or cell, of an anther; the theca, or spore case, of a fungus; the theca of the spinal cord..

Isosporic :: Isosporic (a.) Producing but one kind of spore, as the ferns and Equiseta. Cf. Heterosporic..

Puffball :: Puffball (n.) A kind of ball-shaped fungus (Lycoperdon giganteum, and other species of the same genus) full of dustlike spores when ripe; -- called also bullfist, bullfice, puckfist, puff, and puffin..

Bacterium :: Bacterium (n.) A microscopic vegetable organism, belonging to the class Algae, usually in the form of a jointed rodlike filament, and found in putrefying organic infusions. Bacteria are destitute of chlorophyll, and are the smallest of microscopic organisms. They are very widely diffused in nature, and multiply with marvelous rapidity, both by fission and by spores. Certain species are active agents in fermentation, while others appear to be the cause of certain infectious diseases. See Bacillus

Zygospore :: Zygospore (n.) A spore formed by the union of several zoospores; -- called also zygozoospore.

Spore :: Sporangium (n.) A spore case in the cryptogamous plants, as in ferns, etc..

Epispore :: Epispore (n.) The thickish outer coat of certain spores.

Sporocarp :: Sporocarp (n.) A closed body or conceptacle containing one or more masses of spores or sporangia.

Earthstar :: Earthstar (n.) A curious fungus of the genus Geaster, in which the outer coating splits into the shape of a star, and the inner one forms a ball containing the dustlike spores..

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..

Spore :: Spore (n.) An embryo sac or embryonal vesicle in the ovules of flowering plants.

Blastophore :: Blastophore (n.) That portion of the spermatospore which is not converted into spermatoblasts, but carries them..

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