Placynthium glaciale is a species of saxicolous lichen in the family Placynthiaceae.

Found in Alaska, it was described as a new species in 2020 by lichenologists Alan Fryday and Toby Spribille.

The type specimen was collected in the Hoonah-Angoon Census Area of Glacier Bay National Park, on the upper end of Muir Inlet.

Here the lichen was found growing on an argillite-like boulder as well as exposed cobbles in post-glacial soil.

This Peltigerales-related article is a stub.