Aa calceata (Rchb.f.) Schltr.
Aa calceata is the name of a species, part of the genus Aa.
This name is an alternative combination by Schltr. of an original description of species by Rchb.f. under the rules of the International Code of Nomenclature for algae, fungi, and plants (ICN / commonly called the botany code)..
Botany
Types and valuable specimens