Hypogymnia Apinnata - Thallus foliose, rather closely appressed to loosely pendulous, orbicular to irregular, to 15 cm diam.; lobes hollow, averaging 3-4 mm broad, short to more often elongate, frequently somewhat nodu-lose, often apically perforate, marginal "lobules" absent or at most sparse, branching isotomic- to more often anisotomic-dichotomous; upper surface pale mineral gray to nearly white, shiny, convex, smooth to becoming in part weakly rugose, as seen from above usually (but not always!) bordered by the expanded shiny, black, wrinkled lower surface; soredia absent; medulla thin, cottony, at first white but soon darkening around central cavity. Apothecia common, short stipitate, to 10 mm diam., disc medium to dark brown. Range: Alaska to California. Habitat: Moist conifer forests, low to mid elevations.