On the typification and application of Hieracium diaphanum Fr., with remarks on the diagnostic characters of allied species from southern Sweden

A lectotype for Hieracium diaphanum Fr. (1819) is designated and it is compared with similar species from southern Sweden, i.e. H. pseudodiaphanum (Dahlst.) Johanss., H. jonsbergense T. Tyler, H. hemidiaphanum (Dahlst.) Brenner, H. dalicum Johanss. and H. subglaucovirens Zahn ex Johanss. & Sam. It is concluded that the name H. diaphanum (s. stricto) does belong to a very rare species hitherto only known from two sites in the province of Smaland (S Sweden) whereas the correct name for the most widespread Nordic species of this group is H. pseudodiaphanum (Dahlst.) Johanss