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So the ring is an 'annulus' (think annual/year/cycle?) and the stalk or thingie is a 'stipe' in mushroom talk! I dont know if these are edible - some are delcioius apparently (macropiota?) but I'm too scared as teh lookalikes can be fatal! One thing that might define is whether the annulus slides up and down the stipe or whther it's stuck. Take a photo of top, underneath, side for me?

Good to know the proper names. Here are the photos. The stipe is long and thin and the annulus seem to float.

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Could be a false parasol which is toxic. If the spore print is green. Pop it gill side down on paper with a glass over it.. or a bowl.. overnight. See what the spore print does.

https://en.m.wikipedia.org/wiki/Chlorophyllum_molybdites

I'm always a bit wary as they are so alike!

But look at diff with the edible parasol

Parasol mushroom

https://www.google.com/search?kgmid=/m/0cqhs0&hl=en-AU&q=Parasol+mushroom&kgs=12dfec09ca3a5c03&shndl=17&source=sh/x/kp/osrp/4&entrypoint=sh/x/kp/osrp

See that's why I'm so afraid. Way too hard to identify.

With the brown ones, yes. But with some careful attention and checking with books or in online groups (I'm sure there's some online Brazilian mushroom id group?) you'll learn. I think it's crazy NOT to learn.

It's easier to go by the supermarket and buy xDDD

But what if the apocalypse??? Plus then you can be really clever like me 🦜🤪🥷