The study consists of three replicate stands of each of the three age classes of Douglas- fir. For each stand sample, sporocarps were harvested from 25 circular 4-m2 plots for a total sample area of 100 m2 each sampling season. Circular plots were placed at 25 m intervals and distributed along three transects (8, 9, 8 plots each) in the upper, mid-, and lower slope strata.
From 1991 to 1994, hypogeous sporocarps were collected from the nine stands. Stands were sampled once each in the autumn and spring to capture the dichotomy in seasonal fruiting patterns typical of the Pacific Northwest. Sporocarp production and diversity varies annually so it is necessary to sample stands for several years. In each plot, the percent cover of exposed mineral soil, and coarse woody debris by decay class was recorded (not presented here). Sampled plots were marked with a flag to avoid re-sampling the same area in subsequent seasons. Sporocarps were identified, counted, dried, and weighed to the nearest 0.01 g. Voucher specimens of sporocarps were accessioned into the Oregon State University Herbarium (OSC).
LITERATURE CITED : Bierlmaier FA, McKee A (1989) Climatic summaries and documentation for the primary meteorological station, H.J. Andrews Experimental Forest, 1972 to 1984. General Technical Report PNW-GTR-242. USDA Forest Service, Pac. Northwest Res. Stn., Portland, OR. 56 p.
Franklin JF, Dyrness CT (1984) Natural vegetation of Oregon and Washington. Oregon State University Press, 452 p.
