Phlegmacium boreicyanites

Phlegmacium boreicyanites is a species of fungus in the family Cortinariaceae

Taxonomy
It was originally described in 2014 and classified as Cortinarius boreicyanites. It was placed in the (subgenus Phlegmacium) of the large mushroom genus Cortinarius.

In 2022 the species was transferred from Cortinarius and reclassified as Thaxterogaster argyrionus based on genomic data.

Description
Its fruitbodies have hemispherical to convex caps measuring 4 – in diameter. Initially bluish gray, the cap colour matures to pale grayish brown. Gills on the cap underside have an emarginate attachment to the stipe. They start out greyish blue before changing to brownish violet when the spores mature. The club-shaped to bulbous stipe measures 5 – long, and up to 4 cm wide at the base.

Etymology
The specific epithet boreicyanites refers to its close relationship to Cortinarius cyanites, and its boreal distribution.

Habitat and distribution
Found in the boreal mixed forests of Europe (Sweden, Finland and Scotland).