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The nipple like appearance is referred to in the mycology books as being umbonate. It basically means having a bump in th ecap over the spot where the stem connects to the cap.
For future reference, if you find some mushrooms you want identified, you need to pick some and bring them home (or wherever) with you. a spore print should be one of the first things you do in the identification process. You can sometimes skip making a spore print if the mushroom is very distinctive or you can already see a spore deposit on the stem, another mushroom, or something else under the cap.
When showing us what the mushroom looks like, a view of the underside of the cap is very important. We need to see the gills (or whatever is under there) as well as the upper stem and any ring or ring zone on the stem.
Without more information, any attempts at IDing those mushrooms would be little better than wild guesses.