Mycoporn: A glorious display by a member of San Francisco’s Golden Gate Park, the poisonous, but oh-so-glamorous, Agaricus praeclaresquamosus, the boxy Agaricus. Because the park is regularly irrigated, there are early fruitings of many grassland mushrooms. This was a wonderful and welcoming find, and was initially mistaken as the delicious Prince Mushroom, Agaricus augustus. Some basic differences for the Prince Mushroom include a browner cap and a shaggy stalk, as well as springtime fruiting. This boxy Agaricus was much grayer and exhibited a smooth stalk.
(Golden Gate Park, San Francisco, California, November 9, 2012)