Hi, I found this delicate mushroom in calcareous soil with grasses and sparse weeds close to manure. The pink-gilled and free gills, the smooth pileus and esp. the prominent Volva indicates Volvopluteus or Volvariella. The size of the pileus is about 18mm across and the individual is 30mm tall. I excluded V. gloiocephalus for the small size. I am a bit left without many options here. The cap had fine greyish-brown radial striations (or fibrils). Spore print light brown. Pileipellis a cutis of cylindrical cells of various widths ending with slightly swollen ends. I examined a 3-day old specimen and the lamella were a bit decaying out but spores ovate and with a dextrinoid wall (if I am judging right), basidia pretty large 2 and 4 spored and Cheilocystidia were not numerous but I saw a few that are utriform and short, not much larger from the
What else it could be from gloiocephalus (which is not)?