Allopyrenis tenuis

Summary

Allopyrenis tenuis is a species of squamulose lichen-forming fungus in the family Phylliscaceae. It was first described as a new species in 1963 by Aino Henssen, as Phylliscum tenue. The type of Phylliscum tenue was collected by Henssen in Humboldt County, California, at about 1,000 m elevation. The specimen was gathered from seepage-streaked exposed volcanic rock. Matthias Schultz and María Prieto recombined the taxon into the new genus Allopyrenis in 2024, following a molecular phylogenetics-informed reorganization of the class Lichinomycetes.