This research paper model shows the commensal relationship between mycorrhizal fungi and forest trees. It focuses on the interaction between species of Laccaria, specifically Laccaria bicolor and Laccaria laccata, and Tsuga heterophylla (Western Hemlock). The fungi contribute to the host tree's nutrient and water acquisition through ectomycorrhizal associations. In return, the tree supplies the fungi with carbohydrates derived from photosynthesis.