VI. Chemical investigations of the lidien species Alectoria nigricans (ACH.) Nyl. and Parmelia alpicola Th. Fr.

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Abstract
Parmelia alpicola Th. Fr. and Alectoria nigricans (Ach.) Nyl. have been chemically investigated with special regard to their content of lichen substances. Both the species have been found to contain Alectorialic acid as the main compound and probably Thamnolic acid in trace amounts. In addition to these two acids, mannitol and a tetrahydroxy fatty acid have been isolated from Parmelia alpicola. Further-more three unidentified substances have been detected in the same lichen species by paper chromatographic separation. Alectorialic acid was identified as a depside aldehyde and most likely as a mixed orcinol and β-orcinol derivate. The depside was hydrolysed and the aldehyde-component was found to be Atranol.

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