Sigh....
I wrote a two page explaination of the process of identifying mushrooms and why it was nearly impossible to do so with pictures on an internet site but one swipe of my palm on the pad of this laptop left me with.. not two pages of sage advice but a single period.
you cannot be "100 percent certain" of the variety of mushroom you have by having someone else look at a picture. There are some mushrooms that are universaly recognizable and actually choice to eat. Any decent picture of a shaggy mane will suffice. Any close up, with a few answers will positively ID a p. cubensis but beyond that? no.
People seem to think that one look at one mushroom in one phase of it's cycle should be enough, like looking at a flower or a leaf but it is not.
In order to identify a mushroom the forager needs to have distinction. What is the mushroom? does it have a pelicle? is it sticky? easily removeable? does it have a persistant anulus? what is the shape of the cap? how do the gills attach to the stem if at all? does the mushroom grow singularly or in clusters? what is the mushroom growing on - REALLY, there is a story of a man who found a patch of mushrooms that looked like they were growing on decaying leaves, but they were actually growing on the dead carcass of a dog that was burried beneith the leaves.
What color, if any does the bruise produce? what color is the spore print? what season? more importantly, WHERE? I have told this story before I was foraging in an area in southern california and found the most beautiful stand of amanitas I had ever seen, But they were a deadly variety. I read a few days later that a family from some other continent, who KNEW their mushrooms were deadly sick and needed liver transplants. They had transplanted their intimate knowlege of mushrooms from their homeland to a new place, and that was enough to fool them into thinking that these must be those they were familiar with (I can't say for certain they were the amanitas I saw or if they were amanitas at all).
Even experts can be fooled, in the case of galerina, galerina grows in close proximity to a valued hallucinogenic variety, and it looks very much like them, the unwary can easily scoop up that galerina along with the fruit they know postivily to be their target species only to become violently ill While they are tripping. You don't ever want to be high and begin to believe that you may have consumed a deadly variety as well.
what does the mushroom fruit smell like? often there is a characteristic smell. Mushrooms morph, they change over their growth cycle and can often, in a younger stage, look like a mushroom that is edible when a day later they will show themselves to be what they really are.
Now, beyond that, many people see what they want to see and they believe in some strange way that mushrooms are either edible, poisonous or hallucinogenic. The truth is that unless you have that distinction and you happen to live in the right place, hallucinogenic mushrooms are rather rare. in fact there aren't that many poisonous ones either, most mushrooms are simply - mushrooms, they might not taste good, they might simply be inedible, tough, sour, bitter, woody, slimy or what have you. you are not forever taking your life in your hands by eating some random mushroom from out of your garden - but what really are you willing to risk to have to get on a waiting list for a spare liver? to spend three days throwing up in the ER? To have the doctor ask you for a piece of what ever it is that you ate that is causing you to have horrendous hives, oh, but you didn't save even a single specimen for the guy.
If you are truely interested in mushrooms and foraging for them - get yourself a regional key. learn to use it. Hang out with foragers and have them teach you, learn one strain at a time, learn it well, see it in all it's forms and locations and then move on to the next. Find some experts in your area and make the time to walk around and observe. There are no free lunches, unless you planted them yourself, unless you live in parts of the south east or the north west you likely are NOT going to find hallucinogenic mushrooms all by yourself, if at all.
I have been foraging for mushrooms for 40 years. I have never ever come upon a hallucinogenic variety all by my self. I had to be led to secret places or had a knowlegeable person point at a field and say "have at it, you might get lucky". This is not to say that it is impossible it is to say, back to the original question, yah can't just snap a picture of a mushroom that grows under your rose bush and even hope that it is something that will get you high.