Barssia oregonensis, a crenulate hypogeous fungi very commonly found from December through early July at Paul Bishop's, is easily distinquished, even in the field, by one(or more) large apical pores leading into the gleba. This is an edible species. Today, it was the most abundant species collected. Always found with Douglas-fir in my experience. When mature, the peridium (outside) becomes nearly reddish and can have minute warts; the gleba (interior) starts as a hollow cavity, gradually filling in over time. Mature spores are pinkish, and can be seen with a hand lens. In the larger truffle collection photos for 3-23-2010, Barssia oregonensis is the mass on the upper right-hand side.