Asterella ludwigii (Schwägr.) Underw. ex Frye & L.Clark
Asterella ludwigii is the name of a species, part of the genus Asterella.
This name is an alternative combination by Underw. ex Frye & L.Clark of an original description of species by Schwägr. under the rules of the International Code of Nomenclature for algae, fungi, and plants (ICN / commonly called the botany code)..