Bolbitiaceae -- Agrocybe, Bolbitius & Conocybe
Agrocybe praecox (California, parks, rarely in nature)
I had seen this Agrocybe before and wondered where to put it, but Else Velinga alerted me recently that this is the same species that have been conquering Europe at speed on mulch beds.
Bolbitius aleuriatus [in depth-->]
(~Conocybe lactea) Together with
these two are the most common little mushrooms occupying the freshly cut
Typical cheilocystidia [more]