Secondary metabolite: gyrophoric acid. Substrate: on siliceous rocks Notes: Umbilicaria krascheninnikovii is similar to U. decussata. The main difference is that the lower surface of U. decussata is soothy black, covered in simple thalloconidia that are lacking in U. krascheninnikovii. In U. decussata this option has led to a reduction in sexual reproduction and thus apothecia are not common in this species. The lack of rhizomorphs readily separates U. krascheninnikovii from U. virginis. Secondary substances: gyrophoric, lecanoric and umbilicaric acids. Substrate and ecology: on siliceous rocks in the boreal areas