Found this puff ball near Salt Lake City, Utah. Looks delicious, but smells gross. Not sure of the species
[Submitted by @rhizomorphicreature]
Almost definitely a Calvatia puffball species! My guess is Calvatia booniana, a common edible in the western US, especially in the Rocky Mountains.
I’m thrown slightly by that central area that is possibly the beginning of the development of a sterile basal stem - which would rule out C. booniana, and would suggest C. cyathiformis or C. craniiformis instead, which appears in the western US, but less frequently than in the east.
All of these are edible, however, and their smell is generally described as non-distinctive.