Ectomycorrhizal Fungi ofTsuga Heterophylla

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Abstract
Fifty fungi have been demonstrated to form ectomycorrhizae in pure culture synthesis with western hemlock. More than a hundred additional fungi are reported to be probable mycorrhiza formers with various hemlock species. Few seem to be host specific to hemlock. We hypothesize that little selection pressure towards evolution of fungal-host specificity exists with hosts such as hemlock, which commonly become established in the understory of established stands of other species.