Asteristion
''Asteristion'' is a genus of lichen-forming fungi in the family Graphidaceae. It has seven species. Previously considered a synonym (taxonomy), synonym of either ''Phaeotrema'' or ''Thelotrema'', molecular phylogenetics, molecular evidence led to its resurrection as a distinct genus. ''Asteristion'' lichens are corticolous lichen, corticolous (bark-dwelling), featuring a continuous thallus with a loose to hardened and a containing calcium oxalate crystals. The , or fruiting bodies, are characterized by their large, often appearance and the presence of distinct . The secondary metabolism, secondary chemistry of these lichens includes major concentrations of stictic acid and minor to trace amounts of associated substances. Taxonomy ''Asteristion'' belongs to the tribe (biology), tribe Wirthiotremateae in the family Graphidaceae. This tribe, revised in 2017 to account for newly clarified phylogenetic relationships, contains the genera ''Wirthiotrema'', ''Austrotrema'', ''Asteri ...
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