Parmotrema xanthinum

Parmotrema xanthinum
Scientific classification
Domain:	Eukaryota
Kingdom:	Fungi
Division:	Ascomycota
Class:	Lecanoromycetes
Order:	Lecanorales
Family:	Parmeliaceae
Genus:	Parmotrema
Species:	P. xanthinum
Binomial name
	Parmotrema xanthinum; (Müll.Arg.) Hale (1974)
Synonyms
	List Parmelia proboscidea var. xanthina Müll.Arg. (1884) ; Parmelia perlata var. xanthina (Müll.Arg.) Stizenb. (1890) ; Parmelia xanthina (Müll.Arg.) Vain. (1890) ; Parmelia xanthina f. isidiosa Müll.Arg. (1891) ;

Parmotrema xanthinum is a species of corticolous (bark-dwelling), foliose lichen in the family Parmeliaceae.^[2] It has a pale yellowish to greenish-grey body (thallus) that attaches loosely to its bark surface. First described in 1884, it was the subject of recent taxonomic studies that showed it to be the same species as the previously distinct Parmotrema madagascariaceum. The lichen can be identified by its broad lobes, 10–20 cm (4–8 in) across, with small finger-like projections (isidia) on its surface and hair-like projections (cilia) along its edges. While particularly common in southeastern North America, including coastal and mountainous regions, it is widely distributed in subtropical and temperate areas worldwide. The species can be chemically distinguished by the presence of specific secondary metabolites including usnic acid and protolichinestrinic acid in its tissues.

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