SUBSTRATE: mostly epiphyte, on tree trunks and branches. CHARACTERISTICS: grey; apothecia rare, soredia very frequent and abundant; rather common species, with white soredia all over the thallus, well separated on the youngest areas (margins), coalescing in the oldest ones, with a characteristic bitter flavor (tested by tasting the dust from the soredia). NAME’S ORIGIN: Latin pertūsus, perforated; ămārus, bitter.
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