Activity on Higher Plants

Numerous lichen substances and lichen extracts are strong inhibitors of germination and growth of higher plants. The results of such studies are listed in Table 16. 

Huneck and Schreiber 409) tested 33 lichen substances (aliphatic acids, depsides, depsidones, dibenzofurans, diphenylbutadienes and xanthones) for their growth inhibitory activity on the following higher plants Lepidium sativum, Pisum sativum, Avena sativa, Cucurbita pepo 

Barbatic acid Inhibition of growth of lettuce seedlings (5dJ) 

4-O-Demethylbarbatic acid Diifractaic acid Evernic acid Lecanoric acid 4-0-Methylorsellinic acid Orsellinic acid Ergochrome AA Phytotoxin 667) 

Lecanoric acid spinach leaves Produces abnormalities in Allium cepa 677) 

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