Show plants discover rals A possibility that certain types ol of pliant growth may come to be more widely used as clues to mineral dei posits has been suggested by university ver sity ot workers they point out that selenium indicator Ini indicator cator and accumulator plants are now commonly rolled relied upon as guides to rocks and soils sell s which carry that element they suggest that vegetation also may be used as a guide to other minerals certain toxic vege tation is known to carry relatively high rare metal values molybdenum being one example |