6 Torbjorg Bjelland et aI. t oa o o GRAPHTS <strong>SCRIPTA</strong> 8 (1997) Figure 1. The distribution of the chemotypes of Cetrelia olivetorum in Norway. o The perlatolic acid chemotype, O The olivetoric acid chemotype.
GRAPHTS SCRTPTA 8 (1997) Results and discussion Two chemotypes of Cetrelia olivetorum were found. t78 specimens contained perlatolic acid as the major diagnostic component in addition to small amounts of imbricaric acid, while 20 specimens contained olivetoric acid. This gives roughly a 9:1 number ratio between the perlatolic - and the olivetoric acid chemotype in Norway. Atranorin was present in all specimens. Culberson & Culberson (1968) noticed that the frequency with which the two chemotypes (species according to Culberson & Culberson 1968) has been found mixed in packets in herbaria indicates that these chemotypes often grow together in the field, and therefore apparently have a very similar physiological ecology. In our material one packet contained both chemotypes. C. olivetorum is widely distributed in southern Norway (Figure 1). Of the chemotype with perlatolic acid (Figure 1), 89 specimens (50 %) have been collected in the inland (Oppland, Buskerud, Telemark, <strong>Oslo</strong>) , 52 specimens (40 %) in the inner fjord districts of Hardangerfjorden and Sognefjorden, and 36 specimens (10 %) on the coast from Aust-Agder to Hordaland. Of the specimens of the olivetoric acid chemotype (Figure 1), 14 specimens (70 %) were mainly from the inland of eastern Norway (upper part of Gudbrandsdalen), 5 specimens (25 %) were from inner Sogn og Fjordane, and one specimen (5 %) from Rogaland. The olivetoric acid chemotype is only known from localities where the other chemotype is also present. The two chemotypes of C. olivetorurn found in Norw ay are morphologically quite similar and must be tested chemically for conclusive identification. As there is no clear cut, obvious ecological difference between them, wg find it difficult to treat them as distinct taxa. With respect to chemotypes found and their distribution our results largely confirm those of Jorgensen & Ryvarden (1969). Selected specimens examined. Olivetoric acid chemorype: Norway. Oppland: Sel, 1992, Tonsberg 17741 (BG). Rogaland: Sandnes, Cetrelia olivetorum in Norwoy 7 1967 , Jorgensen (BG) . Sogn og Fjordane: Lardal, 1978, Krog (O). Perlatolic acid chemotype: Norway. <strong>Oslo</strong>: 'Kr.a.', 1840, Blytt (O). Oppland.. Nord-Fron, 1937, Ahlner (S). Buskerud: Sigdal, 1993, Rui & Timdal 7529 (O). Telemark. Seljord, 1936, Hasselrot (O). Aust-Agder: Lillesand, 1993, Gauslaa 93022 (NLH) . Vest-Agder: Farsund, L979, JalLe (O). Rogaland.'Sandnes, 1969, Jorgensen 3031 (BG). Hordaland: Eidfjord, 1985, Tsnsberg 9340 & Botnen (BG). Sogn og Fjordane.' Aurland , L975, Asthagen 3232 (O). Acknowledgements We thank Per Magnus Jorgensen (Bergen) for discussions and the curators of C, NLH, O, S, TRH, and UPS for loan of material. References Arup, U., Ekman, S., Lindblom, L. & Mattsson, J. E. 1993: High performance thin layer chromatography (HPTLC), an improved technique for screening lichen substances. Lichenologist 25 : 6l-7 l. Culberson, C. F. & Culberson, W. L. L976: Chemosyndromic variation in lichenes. Sysr. Bot. l: 325-339. Culberson, W. L. & Culberson, C. F. 1968: The lichen genera Cetrelia and Platismatia (Parmeliaceae) . Contr. U. S. Natl. Herb. 34: 449-558. Jorgensen, P. M. & Ryvarden, L. L970: Contribution to the lichen flora of Norway. Arbok Univ. Bergen, Mat.-Naturvitensk. Ser. 1969 (10): L-24. Krog, H., Osthagen, H. & Tsnsberg, T. 1994: Lauflora. Norske busk- og bladlav. 2. edition. Universitetsforlaget, <strong>Oslo</strong>. Purvis, O. W. 1992: Cetrelia Culb. & C. Culb. (1968). ^In.' Purvis, O. W., Coppins, B. J., Hawksworth, D. L., James, p. W. & Moore, D. M. (eds), The lichen flora of Great Britain ard lreland. Natural History Museum Publications/The British Lichen Society, London, pp. L76-I77 . Randlane, T. & Saag, A. L99I: Chemical and morphological variation in the genus Cetrelia in the Sovier Union. Lichenologist 23: I 13- 126.
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