Collybia butyracea (Fr.) Quél. Syn. Rhodocollybia butyracea (Bull.:Fr.) Lennox Butter Cap, Butterrübling Collybie savonneuse Butter Cap Cap 3-7cm across, convex becoming flattened with a distinct umbo; dark reddish brown fading to light brown, pale reddish tan, or pale orange-yellow; smooth, greasy (buttery) to the touch. Gills actuate to free, close to crowded, becoming moderately broad; whitish to pale grayish pink. Stem 30-80 x 4-8mm, slightly swollen toward the base, sometimes twisted, becoming hollow; same color as cap or lighter; whitish at the base with cottony hairs; smooth to lined. Flesh watery, soft, thin, but thicker on disc; whitish buff. Odor not distinctive. Taste not distinctive. Spores ellipsoid, smooth,
6-7 x 3-3.5µ. Deposit yellowish. Habitat scattered or in groups on soil and decaying needles under conifers. Common in pine plantations. Found in Europe and northern North America. Season September-October. Edible but not worthwhile.