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European Taxa of Saxicolous Lecidella Containing Chloroxanthones:Identification of Patterns Using Thin Layer Chromatography

Published online by Cambridge University Press:  28 March 2007

Ch. Leuckert  and
J.-G. Knoph
Ch. Leuckert
Affiliation:
Institut fur Systematische Botanik und Pflanzengeographie, Freie Universität Berlin, Altensteinstr. 6, D-1000 Berlin 33, Germany.
J.-G. Knoph
Affiliation:
Institut fur Systematische Botanik und Pflanzengeographie, Freie Universität Berlin, Altensteinstr. 6, D-1000 Berlin 33, Germany.
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Abstract

A method using TLC to recognize compound patterns consisting almost entirely of chloroxanthones in European saxicolous species of Lecidella is described. These are necessary for diagnosis of the taxa studied and of their chemotypes. Two solvents with complementary separatingqualities were required: C, toluene-glacial acetic acid (100:15); J, dichloromethane-acetone (4:1). Although the Rf values in solvent J strongly depend on the concentration of the substances, it is very suitable for identification because the xanthones in this system reveal distinct and characteristic fluorescence colours in UV light, simplifying interpretation enormously. No spray reagents are used. Identifications are made by co-chromatography with authentic lichencompounds

Type
Research Article
Information
The Lichenologist , Volume 24 , Issue 4 , October 1992 , pp. 383 - 397
Copyright
Copyright © British Lichen Society 1992

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