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- Spore - n. - One of the minute grains in flowerless plants, which are analogous to seeds, as serving to reproduce the species.
- Spore - n. - An embryo sac or embryonal vesicle in the ovules of flowering plants.
- 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.
- Spore - n. - One of the parts formed by fission in certain Protozoa. See Spore formation, belw.
- Proembryo - n. - The primary growth from the spore in certain cryptogamous plants; as, the proembryo, or protonema, of mosses.
- Lid - n. - The cover of the spore cases of mosses.
- Zoospore - n. - A spore provided with one or more slender cilia, by the vibration of which it swims in the water. Zoospores are produced by many green, and by some olive-brown, algae. In certain species they are divided into the larger macrozoospores and the smaller microzoospores. Called also sporozoid, and swarmspore.
- Microzoospore - n. - A small motile spore furnished with two vibratile cilia, found in certain green algae.
- Urn - n. - A hollow body shaped like an urn, in which the spores of mosses are contained; a spore case; a theca.
- Fruit - v. t. - The spore cases or conceptacles of flowerless plants, as of ferns, mosses, algae, etc., with the spores contained in them.
- Teleutospore - n. - The thick-celled winter or resting spore of the rusts (order Uredinales), produced in late summer. See Illust. of Uredospore.
- Androspore - n. - A spore of some algae, which has male functions.
- Protonema - n. - The primary growth from the spore of a moss, usually consisting of branching confervoid filaments, on any part of which stem and leaf buds may be developed.
- Sporification - n. - Spore formation. See Spore formation (b), under Spore.
- Prothallus - n. - The minute primary growth from the spore of ferns and other Pteridophyta, which bears the true sexual organs; the oophoric generation of ferns, etc.
- Uredospore - n. - The thin-walled summer spore which is produced during the so-called Uredo stage of certain rusts. See (in the Supplement) Uredinales, Heter/cious, etc.
- Paraphysis - n. - A minute jointed filament growing among the archegonia and antheridia of mosses, or with the spore cases, etc., of other flowerless plants.
- Oospore - n. - A special kind of spore resulting from the fertilization of an oosphere by antherozoids.
- Encystment - n. - A process which, among some of the lower forms of life, precedes reproduction by budding, fission, spore formation, etc.
- Macrozoospore - n. - A large motile spore having four vibratile cilia; -- found in certain green algae.
- Sporangium - n. - A spore case in the cryptogamous plants, as in ferns, etc.
- Sporulation - n. - The act or process of forming spores; spore formation. See Illust. of Bacillus, b.
- Basidiospore - n. - A spore borne by a basidium.
- Zygosperm - n. - A spore formed by the union of the contents of two similar cells, either of the same or of distinct individual plants. Zygosperms are found in certain orders of algae and fungi.
- Ring - n. - An elastic band partly or wholly encircling the spore cases of ferns. See Illust. of Sporangium.
- Acrospore - n. - A spore borne at the extremity of the cells of fructification in fungi.
- 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.
- Spore - n. - One of the parts formed by fission in certain Protozoa. See Spore formation, belw.
- Zygospore - n. - A spore formed by the union of several zoospores; -- called also zygozoospore.