These were found under CA bay, and very near a group of C. pratensis. There are the same size, and look quite a bit like C. pratensis, but they are completely white. They are non-viscid on cap and stipe. Largent's Hygrophorus of CA mention some white-capped species that look like C. pratensis: H. cremeicolor has a creamy white cap, and yellow gills; H. angustifolius is all white but with small sized spores; and H. berkeleyi is ivory colored (not sure how to tell the difference between white, ivory and cream really...), but is moist and slightly viscid. These were slightly damp, and really non-viscid, and all white, really white-white. That suggests H. angustifolius, but Larget remarks that it is rare, he didn't find it, and he only lists it from Hesler and Smith who mention it under redwoods in coastal CA.