swarmspore

from The Century Dictionary.

• noun A naked motile reproductive body produced asexually by certain Fungi and Algæ; a zoöspore. See microcyst.
• noun The peculiar gemmule (see gemmule) of sponges; the so-called planula or ciliated sponge-embryo, regarded not as an embryonic body, but as a coherent aggregate of monadiform spores.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) One of innumerable minute, motile, reproductive bodies, produced asexually by certain algæ and fungi; a zoöspore.
• noun (Zoöl.) One of the minute flagellate germs produced by the sporulation of a protozoan; -- called also zoöspore.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun One of the minute motile reproductive bodies produced asexually by certain algae and fungi.
• noun One of the minute flagellate germs produced by the sporulation of a protozoan.