Hapalosiphon pumilus (Kütz.) Kirch.
Hapalosiphon pumilus is the name of a species, part of the genus Hapalosiphon.
This name is an alternative combination by Kirch. of an original description of species by Kütz. under the rules of the International Code of Nomenclature for algae, fungi, and plants (ICN / commonly called the botany code)..
Botany
