Microthamniumlongirostrum is the name of a species, part of the genus Microthamnium.
This species has been described by Thér. under the rules of the International Code of Nomenclature for algae, fungi, and plants (ICN / commonly called the botany code).
Botany
Revisions
Mittenothamniumlongirostrum Thér.Mittenothamniumlongirostrum is the combination used by Thér. in the original description of the species.