Abstract Two isolates of Polyporus tomentosus and one of P. tomentosus vat. circinatus did not form mycorrhizae on either white spruce or red pine in a sterilized nutrient-sphagnum-sand medium in flasks. Seedling roots developed lesions in the flasks and died following heavy cortical infections by these fungi which were still alive and vigorous at the end of the experiment. Similar seedlings inoculated with mycorrhizal tips developed ectotrophic mycorrhizae with typical Hatrig nets and thin mantles on both tree species.
R. D. Whitney (Wed,) studied this question.
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