Chemical variation in two species of theLecanora subfusca group (Lecanoraceae,lichenizedAscomycotina) |
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Authors: | H. T. Lumbsch G. B. Feige J. A. Elix |
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Affiliation: | (1) Botanisches Institut, Universität Essen, Fachbereich 9, D-45117 Essen, Germany;(2) Chemistry Department, Australian National University, 0200 Canberra, ACT, Australia |
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Abstract: | The chemical variation inLecanora epibryon andL. subimmersa, two species of theL. subfusca group, has been examined. In both species the chemical differences are correlated with geographical distribution, but not with morphological differences. As a consequence the chemotypes are recognized at subspecific level. InL. epibryon three chemical races are segregated according to the various chemosyndromes present. Subspeciesepibryon, containing atranorin and triterpenoids, occurs in the northern hemisphere and South America, while the other two subspecies occur only in the southern hemisphere. The subsp.broccha (Nyl.)Lumbsch, comb. nova, contains atranorin, the stictic acid and the 2,5,7-trichloro-3-O-methylnorlichexanthone chemosyndromes, while subsp.xanthophoraLumbsch, subsp. nova, is similar but lacks the stictic acid chemosyndrome. Two chemical races occur in the pantropical speciesL. subimmersa. While subsp.subimmersa contains atranorin and zeorin, subsp.ramboldiiLumbsch & Elix, subsp. nova, contains an additional ten chlorinated xanthones.L. impressa is reduced to synonymy toL. subimmersa. |
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Keywords: | Lichenized fungi Lecanoraceae Lecanora epibryon L. subimmersa Chemotaxonomy biogeography taxonomy xanthones |
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