The relative frequency of occurrence of sporophores of various Suillus species, as determined in natural stands of certain conifers in northern Idaho, indicated possible mycorrhizal relationships among: S. cavipes and S. grevillei with Larix occidentalis; and S. granulatus, S. sibiricus, S. tomentosus vars. discolor and tomentosus with Pinus monticola. Seedlings of L. occidentalis, P. contorta, P. ponderosa, and Pseudotsuga menziesii were grown aseptically and inoculated with pure cultures of seven species and varieties of Suillus. Mycorrhizae were formed by S. brevipes, S. pallidiceps, and S. tomentosus var. tomentosus with P. contorta and P. ponderosa; S. tomentosus var. discolor with P. ponderosa; and S. grevillei with P. menziesii. Suillus grevillei stimulated dichotomous branching of short roots of P. ponderosa, but no mycorrhizal relationship was formed.
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Larry F. Grand (1968) studied this question.