Novon 14: 377, fig. 1. 2004
Elevation: moderate elevations
Leptodictyum wallacei is known only from Hext Spring in San Saba County. The species is distinguished from the variable aquatic ecotypes of L. riparium by its stiff stems, smaller size, and absence of alar cell elaboration. L. Hedenäs (pers. comm.) has examined an isotype and suggested that the specimen fits well within the variation of L. riparium.