Hypogymnia canadensis Goward & McCune is described as a new species of lichenized fungi from the west coast of North America, ranging from southeastern Alaska to western Oregon, inland to southeastern British Columbia. In many respects similar to H. metaphysodes (Asahina) Rass., H. canadensis is distinguished from that species by an imbricate growth form, more open branching, lobe tips that readily become brown in exposed sites, a darker ceiling of the lobe cavity, and the presence of 3-hydroxyphysodic acid in the medulla (K slowly reddish brown). So far H. canadensis is known from conifers in cool suboceanic to oceanic climates.