Petrova O. The lichen genus Usnea in eastern Gennoscandia. III Shrubby species. Ann. Bot. Fennici. 1999, 36, p. 235-256.

254 Halonen • ANN. BOT. FENNICI 36 (1999) (categories “Near Threatened” and “in need of monitoring”), since there are only a few collec- tions from Finland from last decades. Selected specimens examined . — Finland . Åland: Maarianhamina (Mariehamn), Ytternäs, 1935 Räsänen (H), strain 4. Etelä-Häme: Sääksmäki, Ikkala, Uotila, 1932 Linko- la (H), strain 1. Etelä-Pohjanmaa: Kristiinankaupunki, Ska- tan, 1946 Railonsala (TUR), strain 1. Pohjois-Savo: Kuopio, Laivonsaari, 1942 Räsänen (Räsänen, Lich. Fenn. Exs. no. 735, H, sub U. comosa ), strain 2. Kainuu: Sotkamo, Chyde- nius (H), strain 1. Oulun Pohjanmaa: Hailuoto, Marjaniemi, 1990 Väre 328 (OULU), strain 1. Koillismaa: Kuusamo vil- lage, Kuusela, 1973 Ahti 29504 (H), strain 1. Sompion Lap- pi: Pelkosenniemi, 1994 Soppela (OULU), strain 3. Rus- sia . Leningrad Region. Isthmus karelicus: Roshchino SW (formerly Uusikirkko, Raivola), 1924 Kujala (H), strain 2; Konevitsa, 1938 Räsänen (H), strain 1. Republic of Karelia. Karelia ladogensis: Kurkijoki, Vossina, 1936 Räsänen (H), strain 1; Hiitola, Kyläjärvi, 1931 Räsänen (H), strain 2. EXCLUDED TAXA Usnea florida (L.) F. H. Wigg. var. subcomosa Vain., Acta Soc. Fauna Fl. Fenn.7: 3. 1890.— Usnea subcomosa (Vain.) Vain., Kgl. Danske Vidensk.-Selsk. Skr., Naturwidensk. Math., B, 6: 392. 1924. —Type: Brazil. Minas Gerais (Mi- nas Geraës), Antônio Carlos (Sítio), ad corticem et ramulos arborum, 1885 Vainio , Lich. Brasil. Exs. no. 387 (TUR-V 783!, lectotype, here designated; TUR-V 784!, 785, isolectotypes). Chemistry: usnic (trace), diffractaic, barbatic and 4- O -demethylbarbatic acids and probably a low amount of squamatic acid. The lectotype is Usnea ceratina Ach., but the other isolectotype, which contains usnic, norstictic (trace), stictic, cryptostictic, constictic and protocetraric (trace) acids, seemingly represents Usnea rubicunda Stirt. The East Fennoscandian material named as U. subcomosa mainly contains U. subfloridana specimens. Usnea laricina Vain. ex Räsänen, Ann. Acad. Sci. Fenn., Ser. A4, 34 (4): 17. 1931. — Type: Estonia. Harju- maa, Keila, ad corticem Laricis , 1929 Räsänen (H!, lecto- Fig. 9. Known distribution of Usnea wasmuthii Räsä- nen in East Fennoscandia.