Davydov, E. A., Himelbrant, D. E. & Stepanchikova, I. S. 2011. Contribution to the study of Umbilicariaceae (lichenized Ascomycota) in Russia. II. Kamchatka Peninsula. — Herzogia 24: 251–263.

Two species of Lasallia and 14 of Umbilicaria with one additional variety are reported from the Kamchatka Peninsula. Of these, Lasallia pennsylvanica, Umbilicaria aprina, U. cinereorufescens, U. decussata, U. hirsuta, U. hyperborean var. radicicula and U. rigida are new for the Kamchatka Peninsula. Previous reports of Umbilicaria formosana, U. leiocarpa, U. muehlenbergii, U. polyphylla, U. spodochroa and U. virginis are considered to be doubtful for Kamchatka. The lectotype of Gyrophora hyperborea f. sublaevigata Savicz was designated.