Collection location: Albion, Mendocino Co., California, USA [Click for map]
This one was about 6in in diameter, and clearly a cup shape. Most people agreed they had not seen one this large before.
That specimen has a lot of mileage on it…I also took it to the UC Berkeley Botanic Gardens yesterday when I lectured to the Garden staff. Pleny of wows greeted its appearance, and better yet, the staff had fun crawling around the gardens to bring in fungi for our seminar. More talented folks, formerly fungally oblivious, to join our ranks!