Collection location: Madison Heights, Pasadena, California, USA [Click for map]
Used Arora’s key to arrive at genus (white spore print, weakly textured spores, notched gills, no veil). Used Michael Kuo’s key on mushroomexpert.com to arrive at species (no cystidia). Full notes here.
I tend to be reluctant to put species names on Melanoleucas in California. They are not well studied here. One interesting feature I’ve noticed in several collections is that the older specimens get a very distinctive odor of artificial grape bubble gum.