Propagules of four species of the algal genus Vaucheria—V. aversa, V. frigida, V. prona, and V. undulata—are shown to survive enteric passage through the exotic earthworm, Metaphire levis. One species previously known from the northeastern Connecticut collection site, V. geminata, did not appear in the worm castings cultures, and another, V. aversa, was previously unknown there. In that earthworm castings are a mechanism for the movement of soils, we postulate that they can also be the source of dispersal of Vaucheria propagules which, when wafted into the atmosphere as dust from castings, could disperse to nearby or distant locations.