Infektion und abbau der Wurzelrinde von Fichte durch Fomes annaus1

Infection and Deterioration of Spruce Root Bark by Fomes Annosus . The paper describes the mode of infection and consequent deterioration of spruce root bark by the root rot fungus, Fomes annosus using light and electron microscope observations. Spread of fungal hyphae occurs through bore holes produced by enzymatic activity. Although a definte loss of wall substance occurs, the bark tissues primarily represent merely a pathway for the fungus before it colonieses the xylem.