LITERATURE CITED
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- Trappe, J. M. 1965. Tuberculate mycorrhizae of Douglas-fir. Forest Sci. 11: 27–32.
- Zak, B. 1971. Characterization and classification of mycorrhizae of Douglas fir. II. Pseudotsuga menziesii + Rhizopogon vinicolor. Canad. J. Bot. 49: 1079–1084.