Caloplaca ignea, the "flame lichen" (orange) with a species of yellow Acarospora ("cobblestone lichen" or "cracked lichen") or Pleopsidium on "tombstone slate" in the Sierra foothills, California.
Photograph copyright Stephen/Sylvia Sharnoff
Caloplaca ignea, the "flame lichen" (orange) with a species of yellow Acarospora ("cobblestone lichen" or "cracked lichen") or Pleopsidium on "tombstone slate" in the Sierra foothills, California.
Photograph copyright Stephen/Sylvia Sharnoff