Western Cauliflower Mushroom 
Western flat-top Agaricus 
Western giant puffball 
Western grisette 
Western Lactarius 
Western Panther 
Wet rot 
Whetstone's Amidella 
White American star-footed Amanita 
White Cheese Polypore 
White coral fungus 
White Coral Fungus 
White Coral Jelly Fungus 
White dommecap 
White Dunce Cap 
White green-algae coral 
White Punk 
White-Pored Chicken of the Woods 
Wine glass fungus 
Wine-colored Agaricus 
Wine-staining coral 
Winter Oysterling 
Winter Polypore 
Winter Stalk-Puffball