Safety First! The importance of mushroom identification.
As you are reading these descriptions and potency measurements, keep in mind that these features are averages and subject to variation. Not only does psilocybin content vary wildly between individuals of the species, but misidentifying a mushroom species can be a potentially deadly mistake. Studies have found up to a tenfold difference in potency in mushrooms picked right next to each other. In other words, the averages reported below can be very different from the actual content in a single mushroom. So, start slow and add later if you need.
Worse yet, improper identification of some mushroom species can lead to the ingestion of a species that contains potentially deadly toxins. If not properly treated, the toxins can lead to the life-threatening effects of internal bleeding and related symptoms.
The information here is not inclusive of all physical aspects of the mushrooms that may be important for accurate identification. These are simply broad-stroke features of various species. To learn more about safe and effective identification, proper dosage, and the science behind psychedelic mushrooms, consult Psilocybin Mushrooms of the World by expert mycologist Paul Stamets.