Mycena oregonensis Smith Cap 0.2-1cm across, obtusely cone-shaped to bell-shaped with a papilla; margin flares and becomes wavy in age; bright orangy yellow to yellowish when older; faintly hoary then polished, moist, transparently grooved. Gills adnate with decurrent tooth, distant to subdistant though sometimes appearing close, narrow; orange with darker edges in young specimens. Stem 20-40 x 0.5-I mm, same color as cap; covered with short, downy, yellowish hairs and a few scattered yellow hairs on the base. Flesh thin, brittle; yellow. Odor not distinctive. Taste not distinctive. Spores subcylindric, nonamyloid, 7-8 x 2.5-3ì (9-10 x 3-4.5ì. in 4-spored form). Deposit white. Habitat scattered to gregarious on oak leaves and pine needles of Douglas fir and spruce. Found in the Pacific Northwest. Season September-November. Edibility not known. Comment This is the smallest mushroom in the book. Not normally even 0.5cm across.