Assertion: button mushroom | /r/HasProperty | brown
Facets:
value: until 1926
type: TEMPORAL
Source sentences:
text: We think of creminis as a recent introduction to the marketplace, but all button mushrooms were actually brown until 1926, when a mushroom farmer in Pennsylvania found a cluster of white buttons growing in his beds, which he cloned and began selling as a new variety, which tend to be a bit cheaper than creminis.