XVI International Botanical Congess

In 1998 researchers initiated two 5-year epigeous ectomycorrhizal basidiomycete species richness studies in BLM reserve Douglas-fir forests: the first a chronosequence study and the second a density treatment study in a 65-year old stand scheduled for 5 different thinning treatments [from untreated to regeneration cut]. In each stand or plot two parallel elevationally gradient strip transects (400m2 total/plot) were sampled bi-weekly. 132 density" and 134 chronosequence" species identified from morphological characters were sampled during the first season. In the age-class study, species richness ratios were similar for Inocybe, Lactarius and Russula in all stands, higher for Dermocybe in the 25-year old stand with Phaeocollybia restricted to the 150-year old stand. In the 5 density plots, while 22% species were common to all treatment plots, 49% were found in only one plot.