This seems to be the common spring coprinoid in Yosemite. This is about the third collection of it, and if I had looked at MO first, it would have saved me much time struggling with the key. However the spores on this specimen are a little small (short) for the description. These are 7.8-10.9 X 5.4-7, whereas the description lists them as 10.5-11.5 X 6.0-7.5. If anyone else picks up this species in California and gets it on a drier in time to save it, measure the spores and see what you get.