Notes: Growing directly beneath Pinus rigida with Cedrus deodara nearby; both tree species are non-native ornamentals planted in a landscaped area.
Update: on May 24 (15 days after first observation), found a second specimen near the same individual pine tree. No significant precip in Seattle from May 5 to 20, showers and rain from May 20 to 24. This second specimen was partially buried by pine duff and measured 14 cm high, 15 cm wide, and weighed 595 grams. No bluing observed. A friend told me that fresh porcini are going for $50/lb at Pike Place Market right now, making this mushroom worth a bit over $65 at that rate!