Found only in Alaska, it was formally described as a new species in 2020 by British lichenologist Alan Fryday.

The type specimen was collected in the Hoonah-Angoon Census Area, in Glacier Bay National Park.

Its preferred habitat is siliceous rocks and boulders in wooded areas that are open and well lit.

The specific epithet seakensis uses the letters "seak" to refer to a standard abbreviation for southeast Alaska ("SE AK").

The hypothecium (an area of hyaline to pigmented tissue below the hymenium) measures 100 μm thick and is dark brown.