Study of Georgian Cladoniaceae.

Through updating of the identifications of 1306 specimens housed at the largest herbarium collection in Tbilisi (TBI) and some new collections made in the summer of 2015 along the Greater Caucasus Range in Georgia, a comprehensive list and a key of forty three Georgian Cladonia species are presented. Cladonia acuminata, C. bacilliformis, C. borealis, C. conista, C. cyanipes, C. cyathomorpha, C. cf. libifera, C. macrophyllodes, C. sulphurina, and C. symphycarpa are reported as new to Georgia. Thirteen species of Cladonia were deleted from the earlier checklists. [ABSTRACT FROM AUTHOR]