Explanations on Morel Research. Page 2. 6. There has been an allusion to Morchella being mycorrhizal. The question is its relationship to plant roots. The term mycorrhizal is becoming almost meaningless in the broadness of its use.
All soil microbes more or less have a relationship to plant roots.
The rhizosphere is where everything happens in the soil. Soil bacteria, including Pseudomonas fluorescens, cluster around plant roots, because nutrients accumulate over time in that area. Roots promote that result, since they benefit from the accumulation of nitrogen. This result is not the same as that of true mycorrhizal fungi. The observed result with Morchella was clumping around large roots rather than an association with fine roots.