Unidentified mushrooms

Total mushrooms fount: 48

Gills are pale white and free. Cap is campanulate, with light brown scales transitioning into creamy, almost yellowish flesh. Stalk is long and thin, usually vertical, and a volva is visible on some (as seen on right mushroom in photo). Stalk bruises light tan to brown, seems to contain rhizomorphs on rooted end. Mushrooms grew in groups around one another and sometimes in small clusters of 3-10. Found adjacent to entrance of nature trail, on a groomed lawn and in abundance. Photo contains two samples, one with cap measuring 3.5cm in diameter and stalk roughly 5cm in length; the right mushroom's cap is 2.5cm in diameter and the stalk is 5.5cm in length.
Found them in the yard a few days ago temperature 51 degrees Mushrooms appeared past their prime Found in grass close to a pine and under a thorn apple tree No bruising, spore print about same color as cap When sliced, white inside, no bruising Possibly a Sillus Americanus?
I live in Central Virginia in mixed woods very close to a lake. Found this mushroom yesterday on my way back from the dock. I go this way daily and I had not seen the mushroom before. Since it was in such plain sight it must have grown very fast. I'm wondering what species it is. Thanks Ralf Clement
Growing in grass at edge of pavement No apparent association with wood Gills attached Some brown scaling at top of stem, just below cap
Growing at edge of pavement; mowed grass at side of road No apparent association with wood
fruits bodies in cluster
Found in an open field in Singapore (tropical country)