E-Flora BC: Electronic Atlas of the Flora of British Columbia

Species description:
Thallus small to medium but not minute; lobes averaging to more than 1.5 mm wide, always dorsiventral; isidia present or absent, distinctly wrinkled upper surface AND
Lobe margins naked; isidia, if present, naked AND
Lobes broad or, if elongate, then never both erect and terminating in distinctly swollen tips; lobe tips averaging to less than 0.2 mm thick when moist, seldom strongly wrinkled when dry; habitat and distribution various AND
Lower surface naked or bearing scattered tufts of hair at points of attachment, never distinctly woolly AND
Isidia and/or lobules present over upper surface AND
Thallus distinctly thick, averaging to more than 0.15 mm thick when moist; strictly coastal AND
Upper surface finely wrinkled; isidia coarse, lobulate, scattered

Comments:
The local material differs from typical L. platynum in being thinner than average (i.e., less than 0.2 mm thick) and consistently bearing lobulate isidia over the upper surface.