''Ducatina'' is a genus of umbilicate lichen in the family

Trapeliaceae Trapeliaceae is a family of lichens in the order Baeomycetales. The family contains 12 genera and about 125 species. Taxonomy Trapeliaceae was originally circumscribed by French lichenologist Maurice Choisy in 1929. Hannes Hertel emended the f ...

. It is

monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispe ...

, containing the single species ''Ducatina umbilicata''. Both the genus and species were described as new to science in 2017 by Damien Ertz and Ulrik Søchting. The lichen is widespread and abundant in the remote subantarctic Crozet and Kerguelen Islands in the Indian Ocean, where it grows on the exposed horizontal surfaces of rocks. According to the authors, the

thallus Thallus (plural: thalli), from Latinized Greek (), meaning "a green shoot" or "twig", is the vegetative tissue of some organisms in diverse groups such as algae, fungi, some liverworts, lichens, and the Myxogastria. Many of these organisms ...

morphology is "reminiscent of a weathered metal coin (with the idea that it was hidden on remote islands by some unknown pirates)"; the name ''Ducatina'', derived from the word ''ducatus'', refers to this.

References

Baeomycetales Lichen genera Baeomycetales genera Taxa described in 2017 {{Lecanoromycetes-stub