Jack-o-lantern Mushroom, or the Omphalotus Olearius; this mushroom is known for its orange-yellow color and its blue green bioluminescence observed on the gills in low lighting. Interestingly, though poisonous it does smell and appear appealing and resembles the edible chanterelle mushroom. The Jack-o-Lantern mushroom contains a toxin called muscarine, which if ingested causes excessive secretion of saliva, tears and perspiration; it also elicits diarrhea, nausea, vomiting, stomach cramps, irregular heartbeat, decreasing blood pressure and difficulty breathing.

The Jack-O-Lantern mushroom grows in clusters near stumps, dead trees or buried roots. Its orange cap ranges in size from 5-20 cm, and its stem ranges the same measurements in length and is usually 1-2 cm wide. One of the identifying features of this mushroom is that its gills run down along its stem.