 It is tolerant of a wide range of soil types and pH , except heavy clay and is at its best on nutrient @-@ rich slightly calcareous soils . The roots of the sycamore form highly specific beneficial mycorrhizal associations with the fungus Glomus hoi which promotes phosphorus uptake from the soil . Sycamore mycorrhizas are of the internal arbuscular mycorrhizal type , in which the fungus grows within the tissues of the root and forms branched , tree @-@ like structures within the cells of the root cortex . 
