The first thing to understand about all "fungi" is that the distinction between "Mushrooms" and "Toadstools" is totally arbitrary.
If you touch them or wish to eat them, then the responsibility rests with you.
Know what you are doing, or else be content to buy your "mushrooms" from a Green-grocer.
I stress that the first group of these fungi are "fun" ONLY in the sense that everybody loves to SEE them, but they are DEFINITELY NOT SAFE TO EAT (unless prepared by experts). These are the so-called "Fairy Toadstools" (Amanita muscaria). These are also called "Fly Agaric".
The stuff of fairy tales, and post cards and children's books.
This shot shows a 62mm camera lens cap (2 3/4 inches) for scale.
Note the white flecks on the cap, which are the remains of the "veil" which originally covered the entire fungus fruiting body, prior to it emerging from the soil.
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However, I have to add a caveat - which is that if you propose to eat fungi which you gather, the onus of responsibility for identifying what you have in your hand (or your saucepan) rests with you.
I am confident of what I see, and identify. But what you find might be ever so slightly different, and ever so potentially dangerous. If you know someone of European background, with experience of European Mushrooms (which all of these are), then talk to that person about any fungi which you find growing wild.
There are some seriously dangerous fungi out there.
Canberra, and Melbourne are notorious for dangerous fungi, which grow there, because of all those introduced trees. One of the tricks is to identify the host plants with which the fungi are growing. White fungi growing near Oak trees are especially suspect, as the Death Cap Toadstool commonly grows in Canberra, and the Melbourne region, usually near American Oaks, especially Pin Oaks.
From underneath, they look like a sponge.
I have broken away a small section to show the little vertical tubes which form the"pores".
Click to enlarge the image.
This is Lactarius deliciosus, or the "Saffron Cap". This is a gilled fungus - immediately making it distinguishable from the previous one, which had pores.
You can see the hollow in the centre of the cap of this next image. It is an older specimen which has been "scraped" by slugs or snails, which obviously love these fungi.
From underneath, its identity is immediately obvious.When seen from underneath, the Saffron Cap has a distinctive spotted stem, and the diagnostic feature is the way the cap, if broken, reveals the bright orange interior colour. Click to enlarge the image.
Most readers will recognise this as the familiar Field Mushroom (Agaricus campestris).
It is a young specimen, freshly opened, with the pinkish-fawn tones in its gills.
Kindly note the disclaimer issued by the WA Dept of Agriculture on that Website linked above.
This is NOT a diagnostic feature between '"Safe" Mushrooms and toxic ones
- despite what you might have been told.
"Peelability" is a positive indicator of this species, but it is NOT a diagnostic feature, in itself.
Other poisonous species of gilled fungi also peel easily. Look for gill colour, and for any discolouration when the gills are bruised.
Even apparently safe-looking "Mushrooms" with strong "chemical" odours are to be avoided. Some dangerous ones smell like "safe mushrooms".
Ultimately, identification of "Field Mushrooms" must be carefully judged on a number of factors.
Refer back to that W.A. site linked above.