Arbutoid mycorrhiza is another type of mycorrhiza and only forms on some Arctostaphylos, the Arbutus and a few Rhododendron types. There is some dispute as to its identity. The arbutoid fungi are basidiomycetes and are also called ectendomycorrhiza. We treat it here as ectomycorrhiza as we have found in our installations they are interchangeable as long as we plant by community. We believe that it is ecologically more sound if a mixture of ectomycorrhizal fungi were present on the seedlings and in the soil.
Monoculture is inherently unstable whether it be plant, animal or fungus.
As the plant community matures the mycorrhizal associations also mature and change. I think it is hard to match the perfect single mycorrhizal partner for each site. If there are any mycorrhiza on site, those, along with a number of viable associations on the container grown stock should be encouraged. If your plant has only one mycorrhizal partner, it will be without mycorrhizal protection when the fungus goes dormant during its yearly dormancy. The other main type of mycorrhiza is Vesicular- arbuscular.