Notes on the lichen genusRhizoplacafrom continental Antarctica and on some other species from northern Victoria Land

Abstract

AbstractFive taxa of the generaOmphalodinaandRhizoplacaknown from continental Antarctica are reassessed in order to identify a remarkable species collected from northern Victoria Land, for which the new combinationRhizoplaca macleanii(C.W. Dodge) Castello is proposed here. This poorly known species is known only from continental Antarctica. Two synonyms are discussed:Omphalodina exsulans(Th. Fr.) C. W. Dodge andO. siplei(C. W. Dodge & G. E. Baker) C. W. Dodge are synonyms ofRhizoplaca melanophthalma(DC.) Leuckert & Poelt. The correct name of another species isTephromela priestleyi(C. W. Dodge) Øvstedal. The nameO. johnstonii(C. W. Dodge) C. W. Dodge should be abandoned, type material being too scanty for a reliable identification. A contribution to the flora of the Terra Nova Bay area (northern Victoria Land) is provided, with two additional species, includingBuellia vilisTh. Fr. new to Antarctic regions, and two nomenclatural corrections.