Thanks for the update! My observations from these photos:

• as was evident in the first photo, these mushrooms have a membranous partial veil which typically leaves a ring on the stem
• these mushrooms have whitish spores as you can see on the caps of lower mushrooms
• the gills are marginate (the edge of each gill is a different color than the face)
• the cap margins start inrolled and frequently become wavy and are somewhat striated (have little lines where the gills are)

Given these features, I still think they're an Armillaria sp.. Compare A. cepistipes which is said to sometimes have marginate gills.