Ein Beitrag zur Regeneration und zur Infektion dünner Fichtenwurzeln (Picea abies Karst.) durch Basidio‐ und Ascomyceten

Regeneration of thin roots of spruce (Picea abies Karst.) and invasion of them by fungi present in the soil. 266 roots of spruce were severed 35–150 cm from the base of the tree; the diameter of the roots at the cut ends was 0.3–3 cm. Either replacement roots were formed and hyphae mainly of Ascomycetes were found in the original roots only near the cut ends or no new roots were formed and the ascomycetous hyphae had invaded Further. Formation of replacement roots was lower on calcareous soils. At and before the Front of the hyphae a brown substance occurred in the tracheids. Odontia bicolor had invaded the roots of a few trees on the calcareous soil, Fomes annosus was found in only one thin root. ‐ Roots with a diameter larger than 3 cm at the cut ends were invaded by Fomes annosus , and no new roots were formed.