Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] ;o6 DISEASES OF CULTIVATED PLANTS LICHENES The majority of lichens are not parasites, and when growing on the bark of trees, are simply saprophytes, deriving no nourishment from the tree. On the other hand, when lichens are present in abundance on the bark of cultivated trees

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