Summary: Pulvinula archeri produces an orange, convex disc up to 0.7cm wide with even margins, featuring its microscopic characters.
Microscopic: spores 9-10.5(11.5) microns in diameter, round, smooth-walled, generally with a single large oil droplet; asci 8-spored or fewer, 135-145 x 10-11 microns, with or without prominent croziers, tapering towards the base; paraphyses slender 1-2 microns wide, "circinate and pigment-filled, mostly branched apically"; hymenium less than 150 microns thick; ectal excipulum relatively small-celled, cells (10)13-15 microns in diameter, globose to subglobose, medullary excipulum of textura intricata, hyphae 2 microns wide
Notes: The description is derived from Pfister(7). It is found in BC, WA, OR, and ID, (Larsen), and Europe including Austria (Pfister).