Smith, J. E.; Molina, R.; McKay, D.; Luoma, D.; Castellano, M. 1996. Ectomycorrhizal fungus diversity in Douglas-fir forests of the Oregon Cascades. In: Azcon-Aguilar, C.; Barea, J. M., eds. Mycorrhizas in integrated systems from genes to plant development: Proceedings of the fourth European Symposium on mycorrhizas; 1994 July 11-14; Granada. Brussels: European Commission: 141-143.
Hypogeous (truffle) and epigeous (mushroom) sporocarps of ectomycorrhizal fungi were harvestedfrom 9 Douglas-fir stands representing 3 forest age classes. Presence or absence of Piloderma bicolor mycelia intruffle plots was recorded. Stands were sampled in autumn and spring, 1991-94. Analyses are in progress to detectdifferences in sporocarp production between forest age classes. Preliminary results show that 52% of the trufflespecies were restricted to a single age class. At least twice as many truffle species restricted to a single age classwere unique to the old-growth and young compared to the rotation-age stands. Fewer old-growth plots containedtruffle sporocarps compared to the rotation-age and young plots. In contrast to truffle sporocarp frequency,Piloderma bicolor occurred in a greater percentage of old-growth plots compared to rotation-age and young-growthplots. Numbers of species for truffles and mushrooms varied significantly between years and between seasons.
Keywords: ectomycorrhizal fungal communities, Douglas-fir stands, forest succession, Pseudotsuga menziesii,Piloderma bicolor