Omphalotus olivascens, commonly known as the western jack-o'-lantern mushroom, is an orange to brown-colored gilled poisonous mushroom endemic to the California Floristic Province. It is sometimes mistaken for chanterelles.

Chanterelle is the common name of several species of fungi in the genera Cantharellus, Craterellus, Gomphus, and Polyozellus. They are orange, yellow or white, meaty and funnel-shaped. On the lower surface, most species have rounded, forked folds that run almost all the way down the stipe, which tapers down from the cap. Many species emit a fruity aroma and often have a mildly peppery taste.