Phytochemische Untersuchungen an westeuropäischen Lasallia-Arten Phytochemical / Investigations on Western European Lasallia Species

Abstract

The secondary product pattern of 38 specimens of Lasallia brigantium (Zsch.) Llano, L. hispanica (Frey) Sancho & Crespo and L. pustulata (L.) Merat were investigated by HPLC. A c­ cording to previous publications gyrophoric acid, lecanoric acid and umbilicaric acid were detected. Additionally two further unknown depsides were found. The presence of the anthraquinone skyrin, new to Lasallia, was shown for L. hispanica and L. pustulata. Skyrin is not equally distributed within the thalli but mainly concentrated in the umbilicus. In L. hispanica skyrin is located in the epihymenium, too. A correlation between secondary product pattern and thallus size or light supply does not exist.

Degradation of alectorialic acid in the lichen genusUsnea

“…Relatively unstable lichen substances may be degraded continuously, both in the lichen itself ( in situ ) or in their extracts ( in vitro ) at room temperature (Posner 1990; Beckett et al . 2015).…”