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By our strict definition, only two conifer genera (Pinus and Larix), both in the Pinaceae, form true ectendomycorrhizas, but this definition may need to be broadened as more tree species are studied. Reports of other genera having this category of mycorrhiza are mainly based on field-collected samples, and these may represent senescent ectomycorrhizas. Although the occurrence of ectendomycorrhizas is currently restricted to two genera of conifers, this represents a significant distribution in that there are close to 100 species of Pinus and 10-12 species of Larix.
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