Collection location: Madison Heights, Pasadena, California, USA [Click for map]
Thought this was an Agaricus…
Scattered in lawn on SW corner of Fillmore and Magnolia.
ST 50×8mm, white to brownish, shiny, smooth, even, little root under ground at bottom, solid, firm, stiff
CAP 40mm wide, perfectly smooth, cracking shallowly radially, skin yellowish to honey buff, shiny
FLESH to 5mm thick, firm, white, not staining, nutty flavor
VEIL somewhat substantial collar-like ring near top (opening on both top and bottom but not movable)
GILLS dirty pale brown, attached to sl notched, ~4mm deep
SPORE print smoky brown, 7.7-9.3×5.0-6.1um, ovoid, smooth, brown, lots of “stuff” inside, thick walls
Keyed (badly) using Arora. I won’t claim to know which species it is within the A. praecox group.