Fingered Jelly Lichen

Lathagrium cristatum, the fingered jelly lichen or fingered rock-jelly, is a species of cyanolichen in the family Collemataceae. Originally described by Carl Linnaeus in 1753, the species has a complex taxonomic history involving numerous synonyms and nomenclatural challenges that were only resolved through formal conservation of the name in 1996. The lichen forms distinctive dark olive-green to blackish rosettes on calcareous rocks, with thin, narrow lobes that have characteristically wavy, toothed margins. It has a widespread...