What type of Calvatia?

[Dmitriy]

Need help identifying these mushrooms, found in the grass near the boardwalk in Staten Island. My guess is that this might be Calvatia cyathiformis. I am familiar with Calvatia craniiformis and gigantea, but I've never found other species of Calvatia. There were no old mushrooms nearby to see the spore color. Any help is much appreciated.
 

[Dave W]

Calvatia cyathiformis usually has a fairly substantial sterile base, ie. the narrower part of a skull/pear shape. But descriptions of this species say that the sterile base sometimes develops as the fruit bodies mature. The thick outer skin seen here is interesting, as are also the gleba that appears to be partially detached from the inner layer of skin and the thick root at the base. Maybe also consider genus Bovista? Seems interesting/unusual. 

[Dmitriy]

Thanks Dave. Will check in a few days the shape of mature mushrooms. I noticed a thick skin too - not like with any other calvatia. I would also add that smell was unusual- sorry that I cannot be more specific.