Term: fern seed: the asexual spore of ferns that resembles dust; once thought to be seeds and to make the possessor invisible
Broader: spore: a small usually single-celled asexual reproductive body produced by many nonflowering plants and fungi and some bacteria and protozoans and that are capable of developing into a new individual without sexual fusion | Unrelated: ground snake: small shy brightly-ringed terrestrial snake of arid or semiarid areas of western North America