. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania, vol. 14. Botany; Botany. 1937] AVean: Parasitism of Polyporus sciiweinitzii 1131 with the ofrowth of Corsican pine as recorded by Aldrieli-Blake (1). This shoot reaction, liowever, was barely perceptible by the end of the experimen- tal period. The diameter of the stems was slio-htly less than that of those receivino- the full nutrient and the needles of a sli«,ditly ])aler j»reen. The amount of root injury in the inoculated cultures. 28 per cent, was "-reater than under conditions
. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania, vol. 14. Botany; Botany. 1937] AVean: Parasitism of Polyporus sciiweinitzii 1131 with the ofrowth of Corsican pine as recorded by Aldrieli-Blake (1). This shoot reaction, liowever, was barely perceptible by the end of the experimen- tal period. The diameter of the stems was slio-htly less than that of those receivino- the full nutrient and the needles of a sli«,ditly ])aler j»reen. The amount of root injury in the inoculated cultures. 28 per cent, was "-reater than under conditions of hi«iiier nitro«»en concenti-ation, and may be inter- preted as showin«»- that nitroj-en deficiency may induce an increased sus- ceptibility. The reduced sui)i)ly of phosphorus nreatly retarded the orowth of roots and shoots in the controls of Series E (Fin-. ], p]). The needles, althou-'h of a deep oreen, were of normal length. Fifty-two per cent of the roots of inoculated i)lants were infected, which is identical with that occurring; uiuler conditions of a full nutrient at pll Pot Cultures of 2-Year-()l(l Trees. In many respects the older plants responch'd in a manner similar to that of the younjr seedlinjrs in the different series. The control plants of Series A showed jrood shoot development, and the character of the root systems indicated favorable â¢â¢rowinj; conditions. This was the only instance in which the mnnber of new roots per plant in the inoculated cultures exceeded that of the controls (Table 2). From table 3 it is plainly evident that infection by the fungus was not severe on roots of the current season or on those of prreater ajre. The fact that the needles of the control plants at pll , Series B, were slow in assumin«r a normal jrreen indicated less favorable jirowinj? conditions than those described above. Shoot jrrowth was little affected except in color. There was an increase in number of roots and in the extension of th
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